3A Breakers | McMaster-Carr

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38 Products

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.

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.

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

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 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

	3	48V DC 277V AC	50/60	10,000 amp @ 277V AC 10,000 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	7026K67	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					3	96V DC 277V AC 480YV AC/277V AC	50/60	10,000 amp @ 277V AC 10,000 amp @ 480V AC 10,000 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	7026K635	000000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									3	277V AC 480YV AC/277V AC	50/60	10,000 amp @ 277V AC 10,000 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	7026K644	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

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 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

	3	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	7026K312	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					3	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	7026K412	000000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									3	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	7026K512	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

DIN-Rail Mount Electronic Circuit Breakers

An electronic trip mechanism makes these circuit breakers fast, precise, and consistent. They continuously monitor current and trip at a precise value compared to the much wider current range in traditional thermal-magnetic breakers. They're good for protecting devices that could be easily damaged by overcurrent such as sensors, HMIs, and controllers. Because they trip electronically, they don't require the bulky housing necessary for thermal trip mechanisms, so they take up less space in your control cabinet. They also eliminate the need for accessories, such as shunt trips, because they can be remotely monitored and controlled. For at the source troubleshooting, they have an indicator light and on/off/reset button for each circuit. To make sure your equipment is receiving the correct voltage, these breakers will also trip when the supply voltage goes under or over a set value.

Adjustable Current—Digital Input/Output


Push-Button Style, 1 Circuit Controlled	Push-Button Style 4 Circuits Controlled	Push-Button Style 8 Circuits Controlled

Adjustable-current breakers let you choose the current at which they’ll trip. As your operation changes, you can adjust when these breakers will trip rather than replacing the entire breaker.

Breakers with digital input/outputs send and receive signals, so you can remotely check the status of your breaker, reset it, and turn it on and off.

4 Circuits Controlled and 8 Circuits Controlled—Breakers that control 4 or 8 circuits allow you to individually set each circuit. If one trips, the others will keep working.

	Current, A	Voltage, V DC	No. of Inputs	No. of Outputs	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Enclosure Rating		Each
Push-Button Style



	1	1, 2, 3, 4, 5, 6, 7, 8	24	1	1	35	Spring-Clamp Terminal	3.7"	0.24"	3.85"	-10 to 145	IP20	3897N11	000000


	4	2, 3, 4, 5, 6, 7, 8, 9, 10	24	1	2	35	Spring-Clamp Terminal	3.54"	1.77"	4.55"	-10 to 145	IP20	3897N18	000000
	8	2, 3, 4, 5, 6, 7, 8, 9, 10	24	1	2	35	Spring-Clamp Terminal	5"	1.65"	5.61"	-10 to 145	IP20	3897N21	000000

Adjustable—IO Link


Push-Button Style 4 Circuits Controlled	Push-Button Style 8 Circuits Controlled

Adjustable-current breakers let you choose the current at which they’ll trip. As your operation changes, you can adjust when these breakers will trip rather than replacing the entire breaker.

Breakers with IO Link give you more control than breakers with digital input/outputs. Not only can you check the status to reset or turn your breaker on and off, but you can also adjust their current and view current in real-time. This is helpful when troubleshooting issues such as a breaker that repeatedly trips.

4 Circuits Controlled and 8 Circuits Controlled—Breakers that control 4 or 8 circuits allow you to individually set each circuit. If one trips, the others will keep working.

	Current, A	Voltage, V DC	For DIN Rail Size, mm	Wire Connection	Ht.	Wd.	Dp.	Temp. Range, ° F	Enclosure Rating		Each
Push-Button Style



	4	1, 2, 3, 4, 5, 6, 7, 8, 9, 10	24	35	Spring-Clamp Terminal	3.54"	1.77"	4.55"	-10 to 145	IP20	3897N19	0000000


	8	1, 2, 3, 4, 5, 6, 7, 8, 9, 10	24	35	Spring-Clamp Terminal	5"	1.65"	5.61"	-10 to 145	IP20	3897N22	000000

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.

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

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 277V AC	50/60	10,000 amp @ 277V 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	3	5789T105	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					96V DC 277V AC 480YV AC/277V AC	50/60	10,000 amp @ 277V AC 10,000 amp @ 480V 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	3	5789T119	00000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									277V AC 480YV AC/277V AC	50/60	10,000 amp @ 277V AC 10,000 amp @ 480V 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	3	5789T134	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

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

	3	48V DC 277V AC	50/60	10,000 amp @ 277V 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	5789T412	000000


	2 Poles—Toggle-Switch Style







					Thermal/Magnetic

					3	96V DC 277V AC 480YV AC/277V AC	50/60	10,000 amp @ 277V AC 10,000 amp @ 480V 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	5789T512	00000


					3 Poles—Toggle-Switch Style







									Thermal/Magnetic

									3	277V AC 480YV AC/277V AC	50/60	10,000 amp @ 277V AC 10,000 amp @ 480V 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	5789T612	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

Panel-Mount Equipment Circuit Breakers

Mount these breakers, also known as supplemental protectors, through panels downstream from a branch circuit breaker to protect a single piece of equipment. These breakers can also be used as on/off switches. All are thermal, so they use the heat generated in overcurrent situations to trip the breaker.

Toggle-Switch Style—Screw-On Mount

Image of Product. Front orientation. Circuit Breakers. Panel-Mount Equipment Circuit Breakers, Toggle Switch Manual Reset.

UL 1077—They are rated UL 1077 for protection against 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	For Panel Cutout Dia.	Dp. Behind Panel	Mounting Fasteners Included	Quick-Disconnect Tab Wd.	Temp. Range, ° F	Specs. Met	Certification		Each
1 Pole



	3	75V DC 250V AC	50/60	1,000 amp @ 250V AC 800 amp @ 75V DC	1/4"	2.42"	Yes	0.25"	-20 to 140	UL 1077	UL Recognized Component	7588T22	000000

Blade-Style Circuit Breakers

Protect against overload and short circuits in low-voltage automotive and other electronic applications. These circuit breakers can replace type ATC, AF, ATO, and 257 blade-style fuses. They are thermal, so they trip when heat is generated by overload current.

Manual Reset—Push-Button Style

Manual reset breakers require you to push a button after they trip.

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.

	Breakthrough Current @ Voltage	Mounting Location	Ht.	Wd.	Blade Ht.	Temp. Range, ° F	Enclosure Rating	Specs. Met		Each
48V DC



	3	2,000 amp @ 48V DC	Fuse Block	1 1/2"	0.87"	0.25"	-40 to 185	IP40	SAE J553	4212T41	000000


	72V DC 250V AC



			3	2,000 amp @ 250V AC 2,000 amp @ 72V DC	Fuse Block	2.06"	0.96"	0.25"	0 to 140	—	UL 1077	6493T17	00000

DIN-Rail Mount Holders for 250V AC/72V DC Circuit Breakers