Siemens JDFP63B291 Molded Case Circuit Breaker
- 291A
- 3 Pole
- Bolt-On
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Siemens JDFP63B291 - 291A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the Sentron family, the Siemens JDFP63B291 is a 291A MCCB calibrated for fire pump controllers. It features a thermal-magnetic trip unit with LI protection. This JD-frame breaker utilizes bolt-on mounting with lug terminals. It integrates into Siemens panelboards, switchboards, and motor control centers, accepting 3/0 AWG to 500 kcmil wire. Rated for 65kAIC at 240V and 35kAIC at 480V, the three-pole unit provides robust fault clearing.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JDFP63B291 |
| Series | JDFP |
| Amperage | 291A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 25kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Sentron Panelboards, Switchboards, Motor Control Centers, Fire Pump Controllers |
| Wire Gauge | 2 Cables: 3/0 AWG - 500 kcmil (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 3/0 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL, UL 489 |
| Temp Rating | 40C |
| Construction Features | Calibrated for Fire Pump Application, HACR Rated, Reverse Feed |
| Special Features | Fire Pump Rated |
Product FAQs
4 answersWhat does the FP in the JDFP63B291 catalog number indicate?
The FP designates this as a Fire Pump breaker. While it fits standard Siemens Sentron panelboards, switchboards, and motor control centers that accept JD-frame breakers, it is specifically calibrated to hold during the high inrush currents of fire pump motors to prevent nuisance tripping.
What wire sizes and materials are accepted by the lugs on the JDFP63B291?
The factory-installed lugs accept two cables per phase, ranging from 3/0 AWG to 500 kcmil. They are dual-rated for both copper (Cu) and aluminum (Al) conductors.
How does the trip unit operate on the JDFP63B291?
It features a thermal-magnetic trip unit with LI (Long-Time and Instantaneous) functions. The thermal protection is fixed, while the magnetic instantaneous trip is adjustable, allowing electricians to coordinate the breaker with specific fire pump motor starting currents.
Why is a specialized fire pump breaker required for fire protection systems?
Standard circuit breakers may trip during the massive inrush current of a fire pump motor starting. Fire pump breakers like the JDFP63B291 are calibrated with a higher magnetic trip threshold to ensure the pump continues running during an emergency, prioritizing operation over standard equipment protection.
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