Eaton / Cutler-Hammer PB31000PR Insulated Case Circuit Breaker
- 1000A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer PB31000PR - 1000A 3 Pole Insulated Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy PB family, the Eaton PB31000PR is a 1000A insulated case circuit breaker built for industrial applications. It provides reliable long-time and instantaneous (LI) thermal-magnetic trip functions. This bolt-on breaker installs into Eaton PB series enclosures and switchboards. It serves as a replacement for older units, though modern upgrades like the Series C ND-Frame are available. Featuring Tri-Pac fused protection, it delivers a 200kAIC interrupting rating at 600VAC.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | PB31000PR-R |
| Series | PB |
| Amperage | 1000A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 200kA @ 600VAC |
| Terminal Type | Busbar Connection |
|---|---|
| For Use With | PB Series Enclosures, 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 | Current Limiting, Tri-Pac Fused Protection, Interchangeable Trip Unit, 100% Rated |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
5 answersCan the PB31000PR be installed in standard molded case panelboards?
No, this is a large legacy insulated case circuit breaker designed specifically for PB Series enclosures and heavy-duty industrial switchboards. It will not fit in standard molded case panelboards.
What does the PR suffix indicate on the PB31000PR catalog number?
The PR suffix designates this as a Tri-Pac breaker. It features integrated current limiting fuses alongside the standard thermal-magnetic mechanism, allowing it to safely interrupt faults up to 200kA.
What are the physical connection requirements for installing the PB31000PR?
This breaker requires a bolt-on, rear-connected busbar configuration. It does not use standard cable lugs, so installers must ensure the switchboard bus structure aligns with the breaker terminals and is torqued to Eaton specifications.
What are the modern upgrade paths for the legacy PB31000PR?
While the PB31000PR is a direct replacement for existing PB frame installations, facilities looking to modernize their switchboards often transition to Eaton Series C ND-frame or Power Defense circuit breakers. Note that upgrading to a newer frame will require mounting and busbar modifications.
How does the Tri-Pac design protect downstream equipment during a fault?
By combining a standard trip mechanism with current limiters, the breaker clears high-level short circuits rapidly. This limits the let-through energy, protecting downstream conductors and equipment from severe mechanical and thermal stress.
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