DIN-Rail Mount Equipment 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. They are rated UL1077 for protection against 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.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
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.
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.
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.
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.
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.
Extension terminals raise the wire connection point above distribution bars for easy access to connect power to a set of circuit breakers.
Distribution bar end covers seal the live ends of distribution bars to prevent injury and damage.
Distribution bar terminal covers shield unused, live terminals on distribution bars to prevent injury and damage.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | For DIN Rail Size, mm | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
C Trip Type | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 Pole—Toggle Style | ||||||||||||
| 50 | 277V AC/48V DC | 50/60 | 5,000 A @ 277 V AC 5,000 A @ 48 V DC | 35 | Screw-Clamp Terminals | 3.15" | 0.7" | 2.36" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 000000 |
2 Pole—Toggle Style | ||||||||||||
| 50 | 277V AC/480YV AC/96V DC | 50/60 | 5,000 A @ 277 V AC 5,000 A @ 480 V AC 5,000 A @ 96 V DC | 35 | Screw-Clamp Terminals | 3.15" | 1.4" | 2.36" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 00000 |
3 Pole—Toggle Style | ||||||||||||
| 50 | 277V AC/480YV AC | 50/60 | 5,000 A @ 277 V AC 5,000 A @ 480 V AC | 35 | Screw-Clamp Terminals | 3.15" | 2.09" | 2.36" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 0000000 | 000000 |
D Trip Type | ||||||||||||
1 Pole—Toggle Style | ||||||||||||
| 50 | 277V AC/48V DC | 50/60 | 5,000 A @ 277 V AC 5,000 A @ 48 V DC | 35 | Screw-Clamp Terminals | 3.15" | 0.7" | 2.36" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 00000 |
2 Pole—Toggle Style | ||||||||||||
| 50 | 277V AC/480YV AC/96V DC | 50/60 | 5,000 A @ 277 V AC 5,000 A @ 480 V AC 5,000 A @ 96 V DC | 35 | Screw-Clamp Terminals | 3.15" | 1.4" | 2.36" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 00000 |
3 Pole—Toggle Style | ||||||||||||
| 50 | 277V AC/480YV AC | 50/60 | 5,000 A @ 277 V AC 5,000 A @ 480 V AC | 35 | Screw-Clamp Terminals | 3.15" | 2.09" | 2.36" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 000000 |
| Voltage | Current, A | Frequency, Hz | For DIN Rail Size, mm | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 12-110V AC/12-60V DC | 63 | 50/60 | 35 | Screw-Clamp Terminals | 4.13" | 0.7" | 2.36" | 25° to 100° | UL 489, UL Listed, CSA Certified, CE Marked, IEC 60898 | 00000000 | 000000 |
| 110-415V AC/110-230V DC | 40 | 50/60 | 35 | Screw-Clamp Terminals | 4.13" | 0.7" | 2.36" | 25° to 100° | UL 489, UL Listed, CSA Certified, CE Marked, IEC 60898 | 00000000 | 00000 |
Voltage | Current, A | Frequency, Hz | Industry Designation | No. of Circuits Controlled | Switch Starting Position | For DIN Rail Size, mm | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 230V AC | 6 | 50/60 | DPST | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | 35 | Screw-Clamp Terminals | 3.15" | 0.35" | 2.36" | -40° to 165° F | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 000000 |
Terminal | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For No. of Poles | No. of Terminals | Voltage | Current, A | Ctr.-to-Ctr. | Wd. | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 1 | 57 | 277V AC/480YV AC | 80 | 0.7" | 0.22" | 0.59" | 39.72" | 0.59" | 25° to 212° | UL 1077, UL Listed, CE Marked, IEC 60947-2 | 00000000 | 000000 |
| 2 | 56 | 277V AC/480YV AC | 80 | 0.7" | 0.24" | 1.46" | 39.02" | 0.87" | 25° to 212° | UL 1077, UL Listed, CE Marked, IEC 60947-2 | 00000000 | 000000 |
| 3 | 57 | 277V AC/480YV AC | 80 | 0.7" | 0.24" | 1.46" | 39.72" | 0.87" | 25° to 212° | UL 1077, UL Listed, CE Marked, IEC 60947-2 | 00000000 | 000000 |
| For No. of Poles | Voltage | Current, A | Frequency, Hz | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 1 | 277V AC/480YV AC | 115 | 50/60 | Screw-Clamp Terminals | 1.14" | 1.42" | 0.67" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 000000 |
| 2, 3 | 277V AC/480YV AC | 4 | 50/60 | Screw-Clamp Terminals | 1.14" | 2.36" | 0.67" | -40° to 165° | UL 1077, UL Listed, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 00000 |
| For No. of Terminals | Ht. | Wd. | Dp. | Material | Temp. Range, °F | Specifications Met | Each | |
| 5 | 0.94" | 3.35" | 0.47" | Plastic | -40° to 165° | UL 1077, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 00000 |
DIN-Rail Mount Branch 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. 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. 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.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
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.
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.
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.
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.
Extension terminals raise the wire connection point above distribution bars for easy access to connect power to a set of circuit breakers.
Distribution bar terminal covers shield unused, live terminals on distribution bars to prevent injury and damage.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | For DIN Rail Size, mm | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
C Trip Type | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 Pole—Toggle Style | ||||||||||||
| 50 | 240V AC/48V DC | 50/60 | 10,000 A @ 240 V AC 10,000 A @ 48 V DC | 35 | Screw-Clamp Terminals | 4.13" | 0.7" | 2.36" | -10° to 165° | UL 489, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 000000 |
2 Pole—Toggle Style | ||||||||||||
| 50 | 240V AC/96V DC | 50/60 | 10,000 A @ 240 V AC 10,000 A @ 96 V DC | 35 | Screw-Clamp Terminals | 4.13" | 1.4" | 2.36" | -10° to 165° | UL 489, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 00000 |
3 Pole—Toggle Style | ||||||||||||
| 50 | 240V AC | 50/60 | 10,000 A @ 240 V AC | 35 | Screw-Clamp Terminals | 4.13" | 2.09" | 2.36" | -10° to 165° | UL 489, CSA Certified, CE Marked, IEC 60947-2 | 00000000 | 000000 |
| Voltage | Current, A | Frequency, Hz | For DIN Rail Size, mm | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 12-110V AC/12-60V DC | 63 | 50/60 | 35 | Screw-Clamp Terminals | 4.13" | 0.7" | 2.36" | 25° to 100° | UL 489, UL Listed, CSA Certified, CE Marked, IEC 60898 | 00000000 | 000000 |
| 110-415V AC/110-230V DC | 40 | 50/60 | 35 | Screw-Clamp Terminals | 4.13" | 0.7" | 2.36" | 25° to 100° | UL 489, UL Listed, CSA Certified, CE Marked, IEC 60898 | 00000000 | 00000 |
| Voltage | Current, A | Frequency, Hz | Industry Designation | No. of Circuits Controlled | Switch Starting Position | For DIN Rail Size, mm | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 250V AC | 6 | 50/60 | DPST | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | 35 | Screw-Clamp Terminals | 3.78" | 0.35" | 2.36" | -10° to 165° F | UL 489, UL Listed, CSA Certified, CE Marked, IEC 60898 | 00000000 | 000000 |
Terminal | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For No. of Poles | No. of Terminals | Voltage | Current, A | Frequency, Hz | Ctr.-to-Ctr. | Wd. | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 1 | 12 | 277V AC/480YV AC/96V DC | 80 | 50/60 | 0.7" | 0.2" | 1.28" | 8.06" | 0.61" | -10° to 165° | UL 489, UL Recognized Component, CE Marked, IEC 60898 | 00000000 | 000000 |
| 2 | 12 | 277V AC/480YV AC/96V DC | 80 | 50/60 | 0.7" | 0.2" | 1.28" | 8.06" | 0.61" | -10° to 165° | UL 489, UL Recognized Component, CE Marked, IEC 60898 | 00000000 | 00000 |
| 3 | 12 | 277V AC/480YV AC/96V DC | 80 | 50/60 | 0.7" | 0.2" | 1.28" | 8.06" | 0.61" | -10° to 165° | UL 489, UL Recognized Component, CE Marked, IEC 60898 | 00000000 | 00000 |
| For No. of Poles | Voltage | Current, A | Frequency, Hz | Wire Connection Type | Ht. | Wd. | Dp. | Temp. Range, °F | Specifications Met | Each | |
| 1, 2, 3 | 480V AC/96V DC | 80 | 50/60 | Screw-Clamp Terminals | 2.82" | 0.64" | 1.23" | -10° to 165° | UL 489, UL Recognized Component, CE Marked, IEC 60898 | 0000000 | 000000 |
| For No. of Terminals | Ht. | Wd. | Dp. | Material | Temp. Range, °F | Specifications Met | Each | |
| 3 | 0.94" | 1.9" | 0.63" | Plastic | -10° to 165° | UL 489, UL Recognized Component, CE Marked, IEC 60898 | 00000000 | 00000 |
Square D Load-Center Circuit Breakers
Match these circuit breakers to Square D breaker boxes or panel boards of the same manufacturer series. They meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits. 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.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | Mounting Location | Wire Connection Type | Wd. | Specifications Met | Each | |
QO Series | |||||||||
|---|---|---|---|---|---|---|---|---|---|
2 Pole—Toggle Style | |||||||||
| 50 | 120V AC/240V AC/48V DC | 50/60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC 5,000 A @ 48 V DC | Breaker Box | Snap On | 1 1/2" | UL 489, UL Listed | 00000000 | 000000 |
QOB Series | |||||||||
3 Pole—Toggle Style | |||||||||
| 50 | 120V AC/240V AC/48V DC | 50/60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC 5,000 A @ 48 V DC | Panel Board | Screw-Clamp Terminals | 2 1/4" | UL 489, UL Listed | 00000000 | 000000 |
Homeline Series | |||||||||
1 Pole—Toggle Style | |||||||||
| 50 | 120V AC/240V AC | 50/60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Breaker Box | Snap On | 1" | UL 489, UL Listed | 000000000 | 00000 |
2 Pole—Toggle Style | |||||||||
| 50 | 120V AC/240V AC | 50/60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Breaker Box | Snap On | 2" | UL 489, UL Listed | 000000000 | 00000 |
Siemens Load-Center Circuit Breakers
Use with Siemens EQ series breaker boxes. These circuit breakers meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits. Because they 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.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | Wire Connection Type | Wd. | Specifications Met | Each | |
2 Pole—Toggle Style | ||||||||
|---|---|---|---|---|---|---|---|---|
| 50 | 120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Screw-Clamp Terminals | 2" | UL 489 | 0000000 | 000000 |
Cutler-Hammer Load-Center Circuit Breakers
Install these circuit breakers into Cutler-Hammer CH series breaker boxes. They meet UL 489 requirements for branch circuit protection, so they protect downstream equipment and wiring from overloads and short circuits. 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.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
| Current, A | Voltage | Frequency, Hz | Breakthrough Current | Wire Connection Type | Wd. | Specifications Met | Each | |
2 Pole—Toggle Style | ||||||||
|---|---|---|---|---|---|---|---|---|
| 50 | 120V AC/240V AC | 60 | 10,000 A @ 120 V AC 10,000 A @ 240 V AC | Screw-Clamp Terminals | 1 1/2" | UL 489 | 0000000 | 000000 |
High-Temperature Panel-Mount Circuit Breakers
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 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 | Frequency, Hz | Breakthrough Current | Temp. Range, °F | Ht. | Wd. | Dp. Behind Panel | No. of | Thread Size | Mounting Fasteners Included | Wire Connection Type | Ht. | Wd. | Each | |
1 Pole—Toggle Style | |||||||||||||||
| 50 | 250V AC/80V DC | 50/60 | 1,500 A @ 250 V AC 5,000 A @ 80 V DC | -40° to 185° | 1.45" | 0.76" | 2.573" | 2 | 6-32 | No | Screw Terminals | 2.5" | 0.75" | 00000000 | 000000 |
Harsh-Environment Circuit Breakers
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.
Breakthrough current is the maximum current that the circuit breaker can safely stop in the event of a short circuit.
Push-pull button and lever style breakers can be used as an on/off switch.
Place UL1077 rated breakers downstream from a branch circuit breaker to protect a single piece of equipment. They are also known as supplemental protectors.
| Current, A | Voltage | Breakthrough Current | For Panel Cutout Dia. | Dp. Behind Panel | Mount Type | Mounting Fasteners Included | Wire Connection Type | Temp. Range, °F | Specifications Met | Each | |
1 Pole | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 | 28V DC | 6,000 A @ 28 V DC | 0.49" | 2.48" | Screw On | Yes | Screw Terminals | -65° to 165° | UL 1077, UL Recognized Component | 0000000 | 000000 |
Mounting Holes | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Current, A | Voltage | Breakthrough Current | Ht. | Wd. | Dp. | Mount Type | No. of | Dia. | Mounting Fasteners Included | Wire Connection Type | Temp. Range, °F | Specifications Met | Each | |
1 Pole | ||||||||||||||
| 50 | 48V DC | 1,500 A @ 48 V DC | 3.44" | 2.32" | 1.72" | Screw On | 3 | 0.19" | No | Screw Terminals | -40° to 185° | CE Marked | 00000000 | 000000 |
Mounting Holes | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Current, A | Voltage | Breakthrough Current | Ht. | Wd. | Dp. | Mount Type | No. of | Dia. | Mounting Fasteners Included | Wire Connection Type | Temp. Range, °F | Specifications Met | Each | |
1 Pole | ||||||||||||||
| 50 | 48V DC | 1,500 A @ 48 V DC | 2.89" | 1.9" | 1.44" | Screw On | 2 | 0.25" | No | Screw Terminals | -40° to 185° | CE Marked | 00000000 | 000000 |