Siemens CKL3B400 Molded Case Circuit Breaker
- 400A
- 3 Pole
- Bolt-On
Quantity
Siemens CKL3B400 - 400A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Operating as a high-capacity protective device, this 400-amp legacy C-frame breaker utilizes thermal-magnetic trip technology. It delivers reliable long-time and instantaneous functions for established industrial electrical systems. The bolt-on configuration mounts into older Siemens P4, P5 panelboards, and SB switchboards. Facilities upgrading their infrastructure can replace this exact model with the newer CJD63B400 using an adapter kit.Specifications
| Brand | Siemens |
|---|---|
| Part Number | CKL3B400 |
| Series | CKL |
| Amperage | 400A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 42kA @ 600VAC |
| Frame Type | CKL |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4, P5 Panelboards, SB Switchboards |
| Wire Gauge | (1) 1 AWG-500 kcmil (Cu/Al) or (2) 1 AWG-250 kcmil (Cu/Al) |
| Max Wire | 500 kcmil |
| Min Wire | 1 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, Lug Kits |
|---|---|
| Accessories | Lugs Not Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Integrally Fused |
Product FAQs
5 answersWhat equipment is the Siemens CKL3B400 designed to fit?
This bolt-on breaker is compatible with Siemens P4 and P5 panelboards, as well as SB series switchboards.
What are the accepted wire sizes for the lugs on this breaker?
The standard lugs accept either one 1 AWG to 500 kcmil copper or aluminum conductor, or two 1 AWG to 250 kcmil conductors per phase.
What does the adjustable magnetic trip function allow you to do?
The adjustable magnetic trip lets you tune the instantaneous short-circuit response of the breaker to coordinate with other protective devices in your system, while the thermal overload protection remains fixed.
Is the CKL3B400 part of a current or legacy Siemens product line?
This unit belongs to the legacy Siemens C-frame molded case circuit breaker family. It is often used as a direct replacement in existing P4, P5, or SB distribution equipment.
What precautions should be taken before installing this bolt-on breaker?
Always ensure the panelboard or switchboard is fully de-energized before bolting the breaker to the bus. Verify that the interrupting rating meets or exceeds the available fault current at the installation point.
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