Siemens CKL3B350 Molded Case Circuit Breaker
- 350A
- 3 Pole
- Bolt-On
Quantity
Siemens CKL3B350 - 350A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Providing robust overcurrent defense, the Siemens CKL3B350 is a 350-amp, 3-pole current-limiting circuit breaker. It utilizes a thermal-magnetic trip unit alongside integrally fused Amp-Trap limiters to minimize let-through energy. This bolt-on C-frame breaker fits into Siemens P4 and P5 panelboards, and SB switchboards. The CJD63B350 serves as a replacement when paired with a mounting kit.Specifications
| Brand | Siemens |
|---|---|
| Part Number | CKL3B350-R |
| Series | CKL |
| Amperage | 350A |
| 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 | 250-500 kcmil (Cu), 350-500 kcmil (Al) |
| Max Wire | 500 kcmil |
| Min Wire | 250 kcmil |
| 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 |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
5 answersWhich Siemens panelboards and switchboards are compatible with the CKL3B350?
This bolt-on breaker is designed for installation in Siemens P4 and P5 panelboards, as well as SB series switchboards.
What are the acceptable wire sizes for the standard lugs on this C-frame breaker?
The standard lugs accept 250 to 500 kcmil copper (Cu) conductors or 350 to 500 kcmil aluminum (Al) conductors.
Does this breaker feature an adjustable trip unit?
Yes, it features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection.
Can this breaker replace an older ITE CKL3B350?
Yes. Siemens acquired ITE, and the CKL3B350 catalog number remains the same. A Siemens branded unit is a direct replacement for a legacy ITE unit with the exact same part number.
Is the CKL3B350 considered a current limiting circuit breaker?
Yes, the CKL frame is a current limiting molded case circuit breaker. It is designed to clear high-level fault currents quickly, reducing the let-through energy to downstream components.
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