40A Breakers | McMaster-Carr

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45 Products

Square D Load-Center Circuit Breakers

Match these circuit breakers to Square D breaker boxes or panel boards of the same manufacturer series. Because they are thermal-magnetic, these breakers trip two different ways. They either trip when heat is generated by sustained low-level overload current or quickly when the magnetic coil senses a high-current short circuit.

QO Series


QO Series, 1 Pole	QO Series, 2 Poles	QO Series, 3 Poles

UL 489—They meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	Voltage	Freq., Hz	Breakthrough Current @ Voltage	Mounting Location	Wire Connection Method	Wd.	Specs. Met	Certification		Each
1 Pole—Toggle-Switch Style



	40	48V DC 120V AC 240V AC	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC 5,000 amp @ 48V DC	Breaker Box	Snap On	3/4"	UL 489	UL Listed	6782K301	000000


	2 Poles—Toggle Switch



			40	48V DC 120V AC 240V AC	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC 5,000 amp @ 48V DC	Breaker Box	Snap On	1 1/2"	UL 489	UL Listed	6782K215	00000


			3 Poles—Toggle Switch



					40	48V DC 120V AC 240V AC	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC 5,000 amp @ 48V DC	Breaker Box	Snap On	2 1/4"	UL 489	UL Listed	6782K309	000000

QOB Series


QOB Series, 1 Pole	QOB Series, 2 Poles	QOB Series, 3 Poles

UL 489—They meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	Voltage	Freq., Hz	Breakthrough Current @ Voltage	Mounting Location	Wire Connection	Wd.	Specs. Met	Certification		Each
1 Pole—Toggle-Switch Style



	40	48V DC 120V AC 240V AC	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC 5,000 amp @ 48V DC	Panel Board	Screw-Clamp Terminal	3/4"	UL 489	UL Listed	6782K31	000000


	2 Poles—Toggle Switch



			40	48V DC 120V AC 240V AC	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC 5,000 amp @ 48V DC	Panel Board	Screw-Clamp Terminal	1 1/2"	UL 489	UL Listed	6782K311	00000


			3 Poles—Toggle Switch



					40	48V DC 120V AC 240V AC	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC 5,000 amp @ 48V DC	Panel Board	Screw-Clamp Terminal	2 1/4"	UL 489	UL Listed	6782K312	000000

Homeline Series


Homeline Series, 1 Pole	Homeline Series, 3 Poles

UL 489—They meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	Voltage, V AC	Freq., Hz	Breakthrough Current @ Voltage	Mounting Location	Wire Connection Method	Wd.	Specs. Met	Certification		Each
1 Pole—Toggle-Switch Style



	40	120 240	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC	Breaker Box	Snap On	1"	UL 489	UL Listed	69225K91	000000


	2 Poles—Toggle Switch



			40	120 240	50/60	10,000 amp @ 120V AC 10,000 amp @ 240V AC	Breaker Box	Snap On	2"	UL 489	UL Listed	69225K77	00000

DIN-Rail Mount Branch Circuit Breakers


Extension Terminal	Distribution Bar Terminal Cover	Shunt Trip

Auxiliary Contact	Distribution Bar

Distribution bar terminal covers shield unused, live terminals on distribution bars to prevent injury and damage.

Auxiliary contacts send a signal to other equipment when the circuit trips. They can activate a warning light, initiate a shutdown, or start a backup power source.

Shunt trips receive a signal from equipment to trip your circuit breaker in situations other than overload or short circuit conditions. For example, use them with a smoke detector to shut off power to a system in the event of a fire.

Extension terminals raise the wire connection point above distribution bars for easy access to connect power to a set of circuit breakers.

Mount these circuit breakers directly to DIN rail to protect equipment and wiring in an area of your facility from overloads and short circuits. Because they are thermal-magnetic, these breakers trip two ways. They either trip when heat is generated slowly by consistent low-level overload current, or they trip quickly when the magnetic coil senses a high-current short circuit.

Distribution bars simplify wiring by powering multiple adjacent circuit breakers without needing separate wires for each one. This cuts down on assembly time and space.

C Trip


1 Pole—Toggle-Switch Style	2 Poles—Toggle-Switch Style	3 Poles—Toggle-Switch Style

C-trip circuit breakers are the most common. They’re best for applications such as lighting and control panels, where equipment startup causes a moderate spike in current. They won’t trip until a rush of current reaches 5 to 10 times their rated current.

UL 489—They meet UL 489 requirements for branch circuit protection and are certified as current limiting, so they protect equipment by minimizing passing current during a short circuit.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	For DIN Rail Size, mm	Mounting Location	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification	Current, A		Each
1 Pole—Toggle-Switch Style







	Thermal/Magnetic

	48V DC 240V AC	50/60	10,000 amp @ 240V AC 10,000 amp @ 48V DC	35	DIN Rail	Screw-Clamp Terminal	4.13"	0.7"	2.36"	-10 to 165	UL 489, IEC 60947-2	CSA Certified, CE Marked	40	5789T204	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					96V DC 240V AC	50/60	10,000 amp @ 240V AC 10,000 amp @ 96V DC	35	DIN Rail	Screw-Clamp Terminal	4.13"	1.4"	2.36"	-10 to 165	UL 489, IEC 60947-2	CSA Certified, CE Marked	40	5789T206	00000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									240V AC	50/60	10,000 amp @ 240V AC	35	DIN Rail	Screw-Clamp Terminal	4.13"	2.09"	2.36"	-10 to 165	UL 489, IEC 60947-2	CSA Certified, CE Marked	40	5789T207	000000

Accessories for Circuit Breakers

Shunt Trips

Min. Voltage	Max. Voltage	Current, amp	Freq., Hz	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
12V AC/12V DC	110V AC/60V DC	63	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T474	000000
110V AC/110V DC	415V AC/230V DC	40	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T475	00000

Auxiliary Contacts

Voltage, V AC	Current, amp	Freq., Hz	Switch Designation	No. of Circuits Controlled	Switch Starting Position	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
250	6	50/60	DPST	2	1 Off and 1 On	35	Screw-Clamp Terminal	3.78"	0.35"	2.36"	-10 to 165	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T473	000000

Distribution Bars

					Terminal
For No. of Poles	No. of Terminals	Voltage	Current, amp	Freq., Hz	Ctr.-to-Ctr.	Wd.	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1	12	277V AC 96V DC 480YV AC/277V AC	80	50/60	0.7"	0.2"	1.28"	8.06"	0.61"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T476	000000
2	12	277V AC 96V DC 480YV AC/277V AC	80	50/60	0.7"	0.2"	1.28"	8.06"	0.61"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T477	00000
3	12	277V AC 96V DC 480YV AC/277V AC	80	50/60	0.7"	0.2"	1.28"	8.06"	0.61"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T478	00000

Extension Terminals

For No. of Poles	Voltage	Current, amp	Freq., Hz	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1, 2, 3	480V AC/96V DC	80	50/60	Screw-Clamp Terminal	2.82"	0.64"	1.23"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T48	000000

Distribution Bar Terminal Covers

For No. of Terminals	Ht.	Wd.	Dp.	Material	Temp. Range, ° F	Specs. Met	Certification		Each
3	0.94"	1.9"	0.63"	Plastic	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T479	00000

D Trip


1 Pole—Toggle-Switch Style	2 Poles—Toggle-Switch Style	3 Poles—Toggle-Switch Style

D-trip circuit breakers prevent nuisance tripping, so they are best for equipment that has a high spike in current at startup, such as transformers, power supplies, and heaters. They will not trip unless a rush of current reaches 10 to 20 times their rated current.

UL 489—They meet UL 489 requirements for branch circuit protection and are certified as current limiting, so they protect equipment by minimizing passing current during a short circuit.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	Breakthrough Current @ Voltage	For DIN Rail Size, mm	Mounting Location	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1 Pole—Toggle-Switch Style







	Thermal/Magnetic

	40	48V DC 240V AC	50/60	10,000 amp @ 240V AC 10,000 amp @ 48V DC	35	DIN Rail	Screw-Clamp Terminal	4.13"	0.7"	2.36"	-10 to 165	UL 489, IEC 60947-2	CSA Certified, CE Marked	5789T443	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					40	96V DC 240V AC	50/60	10,000 amp @ 240V AC 10,000 amp @ 96V DC	35	DIN Rail	Screw-Clamp Terminal	4.13"	1.4"	2.36"	-10 to 165	UL 489, IEC 60947-2	CSA Certified, CE Marked	5789T449	00000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									40	240V AC	50/60	10,000 amp @ 240V AC	35	DIN Rail	Screw-Clamp Terminal	4.13"	2.09"	2.36"	-10 to 165	UL 489, IEC 60947-2	CSA Certified, CE Marked	5789T455	000000

Accessories for Circuit Breakers

Shunt Trips

Min. Voltage	Max. Voltage	Current, amp	Freq., Hz	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
12V AC/12V DC	110V AC/60V DC	63	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T474	000000
110V AC/110V DC	415V AC/230V DC	40	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T475	00000

Auxiliary Contacts

Voltage, V AC	Current, amp	Freq., Hz	Switch Designation	No. of Circuits Controlled	Switch Starting Position	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
250	6	50/60	DPST	2	1 Off and 1 On	35	Screw-Clamp Terminal	3.78"	0.35"	2.36"	-10 to 165	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T473	000000

Distribution Bars

					Terminal
For No. of Poles	No. of Terminals	Voltage	Current, amp	Freq., Hz	Ctr.-to-Ctr.	Wd.	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1	12	277V AC 96V DC 480YV AC/277V AC	80	50/60	0.7"	0.2"	1.28"	8.06"	0.61"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T476	000000
2	12	277V AC 96V DC 480YV AC/277V AC	80	50/60	0.7"	0.2"	1.28"	8.06"	0.61"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T477	00000
3	12	277V AC 96V DC 480YV AC/277V AC	80	50/60	0.7"	0.2"	1.28"	8.06"	0.61"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T478	00000

Extension Terminals

For No. of Poles	Voltage	Current, amp	Freq., Hz	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1, 2, 3	480V AC/96V DC	80	50/60	Screw-Clamp Terminal	2.82"	0.64"	1.23"	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T48	000000

Distribution Bar Terminal Covers

For No. of Terminals	Ht.	Wd.	Dp.	Material	Temp. Range, ° F	Specs. Met	Certification		Each
3	0.94"	1.9"	0.63"	Plastic	-10 to 165	UL 489, IEC 60898	UL Recognized Component, CE Marked	5789T479	00000

DIN-Rail Mount Equipment Circuit Breakers


Auxiliary Contact	Distribution Bar	Distribution Bar Terminal Cover

Distribution Bar End Cover	Shunt Trip	Extension Terminal

Distribution bars simplify wiring by powering multiple adjacent circuit breakers without needing separate wires for each one. This cuts down on assembly time and space. Cut them to the number of terminals that you need.

Distribution bar terminal covers shield unused, live terminals on distribution bars to prevent injury and damage.

Auxiliary contacts send a signal to other equipment when the circuit trips. They can activate a warning light, initiate a shutdown, or start a backup power source.

Extension terminals raise the wire connection point above distribution bars for easy access to connect power to a set of circuit breakers.

Also known as supplemental protectors, these circuit breakers mount directly to DIN rail downstream from a branch circuit breaker to protect a single piece of equipment. Because they are thermal-magnetic, these breakers trip two ways. They either trip when heat is generated slowly by consistent low-level overload current, or they trip quickly when the magnetic coil senses a high-current short circuit.

Distribution bar end covers seal the live ends of distribution bars to prevent injury and damage.

C Trip


1 Pole—Toggle-Switch Style	2 Poles—Toggle-Switch Style	3 Poles—Toggle-Switch Style

UL 1077—They are rated UL 1077 for protection against overloads and short circuits.

	Breakthrough Current @ Voltage	For DIN Rail Size, mm	Mounting Location	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1 Pole—Toggle-Switch Style







	Thermal/Magnetic

	40	48V DC 277V AC	50/60	5,000 amp @ 277V AC 5,000 amp @ 48V DC	35	DIN Rail	Screw-Clamp Terminal	3.15"	0.7"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K631	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					40	96V DC 277V AC 480YV AC/277V AC	50/60	5,000 amp @ 277V AC 5,000 amp @ 480V AC 5,000 amp @ 96V DC	35	DIN Rail	Screw-Clamp Terminal	3.15"	1.4"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K683	000000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									40	277V AC 480YV AC/277V AC	50/60	5,000 amp @ 277V AC 5,000 amp @ 480V AC	35	DIN Rail	Screw-Clamp Terminal	3.15"	2.09"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K86	000000

Accessories for Circuit Breakers

Shunt Trips

Min. Voltage	Max. Voltage	Current, amp	Freq., Hz	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
12V AC/12V DC	110V AC/60V DC	63	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T474	000000
110V AC/110V DC	415V AC/230V DC	40	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T475	00000

Auxiliary Contacts

Voltage, V AC	Current, amp	Freq., Hz	Switch Designation	No. of Circuits Controlled	Switch Starting Position	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
230	6	50/60	DPST	2	1 Off and 1 On	35	Screw-Clamp Terminal	3.15"	0.35"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K686	000000

Distribution Bars

				Terminal
For No. of Poles	No. of Terminals	Voltage	Current, amp	Ctr.-to-Ctr.	Wd.	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1	57	277V AC 480YV AC/277V AC	80	0.7"	0.22"	0.59"	39.72"	0.59"	25 to 212	UL 1077, IEC 60947-2	UL Listed, CE Marked	7026K671	000000
2	56	277V AC 480YV AC/277V AC	80	0.7"	0.24"	1.46"	39.02"	0.87"	25 to 212	UL 1077, IEC 60947-2	UL Listed, CE Marked	7026K672	000000
3	57	277V AC 480YV AC/277V AC	80	0.7"	0.24"	1.46"	39.72"	0.87"	25 to 212	UL 1077, IEC 60947-2	UL Listed, CE Marked	7026K673	000000

Extension Terminals

For No. of Poles	Voltage	Current, amp	Freq., Hz	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1	277V AC 480YV AC/277V AC	115	50/60	Screw-Clamp Terminal	1.14"	1.42"	0.67"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K678	000000
2, 3	277V AC 480YV AC/277V AC	4	50/60	Screw-Clamp Terminal	1.14"	2.36"	0.67"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K677	00000

Distribution Bar End Covers

For No. of Poles	Ht.	Wd.	Dp.	Material	Temp. Range, ° F	Specs. Met	Certification	Pkg. Qty.		Pkg.
1	0.55"	0.19"	0.37"	Plastic	-40 to 165	UL 1077, IEC 60947-2	CSA Certified, CE Marked	10	7026K676	000000
2, 3	0.94"	0.69"	0.31"	Plastic	-40 to 165	UL 1077, IEC 60947-2	CSA Certified, CE Marked	10	7026K675	00000

Distribution Bar Terminal Covers

For No. of Terminals	Ht.	Wd.	Dp.	Material	Temp. Range, ° F	Specs. Met	Certification		Each
5	0.94"	3.35"	0.47"	Plastic	-40 to 165	UL 1077, IEC 60947-2	CSA Certified, CE Marked	7026K674	00000

D Trip


1 Pole—Toggle-Switch Style	2 Poles—Toggle-Switch Style	3 Poles—Toggle-Switch Style

UL 1077—They are rated UL 1077 for protection against overloads and short circuits.

	Breakthrough Current @ Voltage	For DIN Rail Size, mm	Mounting Location	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1 Pole—Toggle-Switch Style







	Thermal/Magnetic

	40	48V DC 277V AC	50/60	5,000 amp @ 277V AC 5,000 amp @ 48V DC	35	DIN Rail	Screw-Clamp Terminal	3.15"	0.7"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K317	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					40	96V DC 277V AC 480YV AC/277V AC	50/60	5,000 amp @ 277V AC 5,000 amp @ 480V AC 5,000 amp @ 96V DC	35	DIN Rail	Screw-Clamp Terminal	3.15"	1.4"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K417	000000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									40	277V AC 480YV AC/277V AC	50/60	5,000 amp @ 277V AC 5,000 amp @ 480V AC	35	DIN Rail	Screw-Clamp Terminal	3.15"	2.09"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K517	000000

Accessories for Circuit Breakers

Shunt Trips

Min. Voltage	Max. Voltage	Current, amp	Freq., Hz	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
12V AC/12V DC	110V AC/60V DC	63	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T474	000000
110V AC/110V DC	415V AC/230V DC	40	50/60	35	Screw-Clamp Terminal	4.13"	0.7"	2.36"	25 to 100	UL 489, IEC 60898	UL Listed, CSA Certified, CE Marked	5789T475	00000

Auxiliary Contacts

Voltage, V AC	Current, amp	Freq., Hz	Switch Designation	No. of Circuits Controlled	Switch Starting Position	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
230	6	50/60	DPST	2	1 Off and 1 On	35	Screw-Clamp Terminal	3.15"	0.35"	2.36"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K686	000000

Distribution Bars

				Terminal
For No. of Poles	No. of Terminals	Voltage	Current, amp	Ctr.-to-Ctr.	Wd.	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1	57	277V AC 480YV AC/277V AC	80	0.7"	0.22"	0.59"	39.72"	0.59"	25 to 212	UL 1077, IEC 60947-2	UL Listed, CE Marked	7026K671	000000
2	56	277V AC 480YV AC/277V AC	80	0.7"	0.24"	1.46"	39.02"	0.87"	25 to 212	UL 1077, IEC 60947-2	UL Listed, CE Marked	7026K672	000000
3	57	277V AC 480YV AC/277V AC	80	0.7"	0.24"	1.46"	39.72"	0.87"	25 to 212	UL 1077, IEC 60947-2	UL Listed, CE Marked	7026K673	000000

Extension Terminals

For No. of Poles	Voltage	Current, amp	Freq., Hz	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1	277V AC 480YV AC/277V AC	115	50/60	Screw-Clamp Terminal	1.14"	1.42"	0.67"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K678	000000
2, 3	277V AC 480YV AC/277V AC	4	50/60	Screw-Clamp Terminal	1.14"	2.36"	0.67"	-40 to 165	UL 1077, IEC 60947-2	UL Listed, CSA Certified, CE Marked	7026K677	00000

Distribution Bar End Covers

For No. of Poles	Ht.	Wd.	Dp.	Material	Temp. Range, ° F	Specs. Met	Certification	Pkg. Qty.		Pkg.
1	0.55"	0.19"	0.37"	Plastic	-40 to 165	UL 1077, IEC 60947-2	CSA Certified, CE Marked	10	7026K676	000000
2, 3	0.94"	0.69"	0.31"	Plastic	-40 to 165	UL 1077, IEC 60947-2	CSA Certified, CE Marked	10	7026K675	00000

Distribution Bar Terminal Covers

For No. of Terminals	Ht.	Wd.	Dp.	Material	Temp. Range, ° F	Specs. Met	Certification		Each
5	0.94"	3.35"	0.47"	Plastic	-40 to 165	UL 1077, IEC 60947-2	CSA Certified, CE Marked	7026K674	00000

Siemens Load-Center Circuit Breakers

Poles—Toggle-Switch

Style

Use with Siemens EQ series breaker boxes. Because they are thermal-magnetic, these circuit breakers trip two different ways. They either trip when heat is generated slowly by consistent low-level overload current or quickly when the magnetic coil senses a high-current short circuit.

UL 489—These circuit breakers meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	Breakthrough Current @ Voltage	Mounting Location	Wire Connection	Wd.	Specs. Met		Each
2 Poles—Toggle-Switch Style







	Thermal/Magnetic

	40	120 240	60	10,000 amp @ 120V AC 10,000 amp @ 240V AC	Breaker Box	Screw-Clamp Terminal	2"	UL 489	5259T54	000000

Harsh-Environment Circuit Breakers


1 Pole—Push-Pull-Button Style	1 Pole—Lever Style	1 Pole—Push-Button Style

Built to resist vibration and corrosion in harsh environments, these circuit breakers protect against overload and short circuits in low-voltage automotive and other electronic applications. All are thermal, so they use the heat generated in overcurrent situations to trip the breaker.

Lever Manual Reset and Push-Pull Button Manual Reset—Push-pull button and lever style breakers can be used as an on/off switch.

UL 1077—Place UL 1077-rated breakers downstream from a branch circuit breaker to protect a single piece of equipment. They are also known as supplemental protectors.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

							Mounting Holes										Screw On
	Current, A	Voltage, V DC	Breakthrough Current @ Voltage	For Panel Cutout Dia.	Dp. Behind Panel	Mounting Location	No. of	Dia.	Mounting Fasteners Included	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
1 Pole—Push-Pull-Button Style







				Thermal

				40	28	6,000 amp @ 28V DC	0.49"	2.48"	Panel	—	—	Yes	Screw Terminal	—	—	—	-65 to 165	UL 1077	UL Recognized Component	6608T13	000000


				1 Pole—Lever Style







								Thermal

								40	48	1,500 amp @ 48V DC	—	—	—	3	0.19"	No	Screw Terminal	3.44"	2.32"	1.72"	-40 to 185	—	CE Marked	4514K223	00000


								1 Pole—Push-Button Style







												Thermal

												40	48	1,500 amp @ 48V DC	—	—	—	2	0.25"	No	Screw Terminal	2.89"	1.9"	1.44"	-40 to 185	—	CE Marked	4514K132	00000

Cutler-Hammer Load-Center Circuit Breakers

Poles—Toggle-Switch

Style

Install these circuit breakers into Cutler-Hammer CH series breaker boxes. Because these circuit breakers are thermal-magnetic, they trip two different ways. They either trip when heat is generated slowly by consistent low-level overload current or quickly when the magnetic coil senses a high-current short circuit.

UL 489—They meet UL 489 requirements for branch circuit protection and are certified as current limiting, so they protect equipment by minimizing passing current during a short circuit.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	Breakthrough Current @ Voltage	Mounting Location	Wire Connection	Wd.	Specs. Met		Each
2 Poles—Toggle-Switch Style







	Thermal/Magnetic

	40	120 240	60	10,000 amp @ 120V AC 10,000 amp @ 240V AC	Breaker Box	Screw-Clamp Terminal	1 1/2"	UL 489	5259T84	000000

DIN-Rail Mount Ground Fault Circuit Protectors


2 Poles—Toggle-Switch Style	4 Poles—Toggle-Switch Style

Add ground fault protection to a circuit to minimize the risk of electric shock to workers and equipment if there is a current leak. These protectors will trip if they detect a current leak above 30 mA. However, they do not protect against overloads. Pair them with a circuit breaker to fully protect a circuit. Commonly used in electrical enclosures, these protectors mount directly to DIN rail.

UL 1053—These protectors meet strict UL 1053 standards for ground fault detecting devices.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

	Voltage, V AC	Freq., Hz	Breakthrough Current @ Voltage	Ground Fault Sensitivity, mA	For DIN Rail Size, mm	Mounting Location	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Specs. Met	Certification		Each
2 Poles—Toggle-Switch Style



	40	120 208YV AC/120V AC	50/60	5,000 amp @ 120V AC 5,000 amp @ 208V AC	30	35	DIN Rail	Screw-Clamp Terminal	3.15"	1.38"	2.36"	-10 to 100	UL 1053, IEC 61008	UL Listed, CE Marked	4418N12	0000000


	4 Poles—Toggle-Switch Style



			40	120 208YV AC/120V AC	50/60	5,000 amp @ 120V AC 5,000 amp @ 208V AC	30	35	DIN Rail	Screw-Clamp Terminal	3.15"	2.76"	2.36"	-10 to 100	UL 1053, IEC 61008	UL Listed, CE Marked	4418N15	000000

High-Temperature Panel-Mount Circuit Breakers

Pole—Toggle-Switch

Style

Unlike breakers that trip thermally, these breakers have a hydraulic-magnetic trip mechanism, so they aren’t affected by changes in temperature. Instead, these circuit breakers trip when they hydraulically sense consistent low-level overload current, or they trip quickly when the magnetic coil senses a high-current short circuit. Use the threaded holes on the face to install them through panels, enclosure covers, or walls to keep them close to the equipment they protect.

Breakthrough Current @ Voltage—Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.

						For Panel Cutout			Mounting Holes
	Current, A	Voltage	Freq., Hz	Breakthrough Current @ Voltage	Temp. Range, ° F	Ht.	Wd.	Dp. Behind Panel	No. of	Thread Size	Mounting Fasteners Included	Wire Connection	Ht.	Wd.		Each
1 Pole—Toggle-Switch Style



		40	80V DC 250V AC	50/60	1,500 amp @ 250V AC 5,000 amp @ 80V DC	-40 to 185	1.45"	0.76"	2.573"	2	6-32	No	Screw Terminal	2.5"	0.75"	72015K36	000000