Eaton / Cutler-Hammer PB31000 Insulated Case Circuit Breaker
- 1000A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer PB31000 - 1000A 3 Pole Insulated Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for heavy industrial applications, this 3-pole, 1000A insulated case breaker delivers dependable power distribution control for high-capacity electrical loads. The bolt-on configuration mounts into standard PB series enclosures and switchboards. For modernization projects, this legacy frame is typically replaced by Eaton's Series C ND-Frame or Power Defense PD5 models. Equipped with an interchangeable thermal-magnetic trip unit, it provides LI protection and 100kAIC at 480VAC.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | PB31000-R |
| Series | PB |
| Amperage | 1000A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 125kA @ 240VAC, 100kA @ 480VAC, 100kA @ 600VAC, 100kA @ 250VDC |
| Frame Type | PB |
|---|---|
| Terminal Type | Busbar Connection |
| For Use With | PB Series Enclosures, PB Panelboards, Switchboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Adjustable Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs Not Included, Mounting Hardware |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | 100% Rated, Interchangeable Trip Unit |
Product FAQs
5 answersWhat panelboards and switchboards are compatible with the PB31000?
This breaker is designed specifically for installation in legacy Westinghouse, Cutler-Hammer, and Eaton PB Series enclosures, PB panelboards, and switchboards.
How is the PB31000 connected within a panelboard?
The PB31000 utilizes a bolt-on mounting style with busbar connections rather than standard wire lugs. This is standard for high-amperage PB frame switchboard applications.
Can the trip unit on the PB31000 be swapped if load requirements change?
Yes. The PB31000 features an interchangeable trip unit design. This allows panel builders to replace the thermal-magnetic trip unit without needing to remove or replace the entire breaker frame.
What adjustments can be made to the PB31000 trip unit?
The included thermal-magnetic trip unit features Long-Time and Instantaneous (LI) functions. Both the thermal and magnetic trip settings are fully adjustable, allowing for precise coordination with your electrical system to prevent nuisance tripping.
Is the PB31000 a direct replacement for older Westinghouse PB breakers?
Yes, this breaker serves as a direct drop-in replacement for legacy Westinghouse and Cutler-Hammer 1000A PB frame breakers. It installs into existing PB panelboards without requiring adapter kits or retrofits.
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