Siemens KP3B1200 Molded Case Circuit Breaker
- 1200A
- 3 Pole
- Bolt-On
Quantity
Siemens KP3B1200 - 1200A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for demanding industrial environments, this 1200A thermal-magnetic device offers robust protection for three-phase systems. It fastens securely into legacy Siemens switchboards utilizing standard bolt-on mounting hardware. Delivering a 65kAIC rating at 240V, the breaker includes load side lugs and supports various field-installable accessories. Facilities looking to transition to current production models can utilize the ND63B120 as a substitute.Specifications
| Brand | Siemens |
|---|---|
| Part Number | KP3B1200-R |
| Series | KP |
| Amperage | 1200A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC |
| Frame Type | KP |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Switchboards, Power Panelboards |
| Wire Gauge | (4) 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 | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40°C |
| Construction Features | Interchangeable Trip Unit, Trip-Free Mechanism |
Product FAQs
6 answersWhat type of enclosures accept the KP3B1200 breaker?
The KP3B1200 is a bolt-on molded case circuit breaker designed specifically for installation in Siemens power panelboards and switchboards. It is not compatible with standard residential load centers or plug-on lighting panels.
How does the thermal-magnetic trip unit operate on the KP3B1200?
This breaker uses an LI (Long-Time and Instantaneous) trip function. The thermal element provides fixed protection against long-term overloads, while the magnetic element is adjustable, allowing adjustment of the instantaneous short-circuit trip threshold to suit the specific application.
What are the wire size requirements for the KP3B1200 load lugs?
The factory-installed load-side lugs accommodate up to four copper or aluminum conductors per phase, with a wire gauge range of 3/0 AWG to 500 kcmil. Ensure proper torque specifications are followed during installation.
Does the KP3B1200 include line-side lugs?
No. This specific configuration is designed for bolt-on switchboard and panelboard mounting. It includes load-side lugs for outgoing cables, but the line side is designed to bolt directly to the enclosure busbars.
Can the KP3B1200 be installed in 240V or 480V electrical systems?
Yes. Although rated for a maximum of 600 VAC, this 3-phase breaker can be safely applied in 240V and 480V AC systems. The breaker's short-circuit interrupting capacity is higher at these lower operating voltages.
Is the Siemens KP frame still in active production?
The KP3B1200 is part of the legacy Siemens KP and HP frame family. While exact replacements are often sourced for existing switchboards, new installations typically utilize newer Siemens frame families like the 3VA or VL series.
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