Siemens JKL3B400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Unit Mount
Quantity
Siemens JKL3B400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
A drop-in solution for industrial facilities, the Siemens JKL3B400 is a 400A, 3-pole molded case circuit breaker. It provides long-time and instantaneous (LI) protection functions for reliable electrical safety in demanding environments. The unit mount design ensures compatibility with Siemens P4 and P5 panelboards, SB switchboards, and motor control centers. It is an excellent choice for servicing legacy I-T-E systems, with the JD63B400 serving as its modern replacement.Specifications
| Brand | Siemens |
|---|---|
| Part Number | JKL3B400 |
| Series | JKL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 35kA @ 480VAC, 18kA @ 600VAC |
| Frame Type | JKL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4 Panelboards, Siemens P5 Panelboards, Siemens SB Switchboards, Siemens Motor Control Centers, Legacy I-T-E Panelboards |
| Wire Gauge | (2) 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 | Line and Load Lugs Included |
| Standards | UL 489, CSA C22.2 No. 5, NEMA AB-1 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit, HACR Rated, Trip-Free Mechanism |
Product FAQs
5 answersWhich panelboards and switchboards are compatible with the JKL3B400?
This unit mount breaker installs in Siemens P4 and P5 panelboards, SB switchboards, and Siemens motor control centers. It is also backward compatible with legacy I-T-E panelboards that accept J-frame breakers.
What wire sizes do the standard lugs on the JKL3B400 accept?
The standard lugs accommodate two cables per phase, ranging from 3/0 AWG to 500 kcmil for both copper and aluminum conductors.
Is the trip unit on the JKL3B400 adjustable?
The thermal element for long-time overload protection is fixed at 400 amps. The magnetic instantaneous trip function is adjustable, allowing electricians to fine-tune short-circuit response based on the specific load.
What is the modern replacement for the legacy JKL3B400 circuit breaker?
The Siemens JD63B400 serves as the modern replacement for the legacy JKL3B400. Both are 400A, 3-pole breakers, but you should verify enclosure compatibility and mounting hardware when upgrading.
Does the JKL3B400 provide ground fault or short-time protection?
No. This breaker is equipped with a standard LI (Long-Time and Instantaneous) thermal-magnetic trip unit. It does not include ground fault (G) or short-time (S) protection functions.
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