Siemens / ITE CM3B500 Molded Case Circuit Breaker
- 500A
- 3 Pole
- Bolt-On
Quantity
Siemens / ITE CM3B500 - 500A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed for heavy-duty power distribution, the Siemens CM3B500 is a 500A, 3-pole current-limiting circuit breaker. It provides reliable thermal-magnetic trip functions for industrial facilities. This bolt-on MCCB installs into Siemens switchboards, power panelboards, and motor control centers. As a legacy component, it offers a precise fit for older systems and is officially replaced by the CMD63B500. Amp-trap limiters restrict fault currents, achieving a 100kAIC rating at 480VAC.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CM3B500-R |
| Series | CM3B |
| Amperage | 500A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 65kA @ 600VAC |
| Frame Type | CM |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Switchboards, Motor Control Centers, Power Panelboards |
| Wire Gauge | (3) 1/0 AWG - 500 kcmil |
| Max Wire | 500 kcmil |
| Min Wire | 1/0 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, Amp-trap Current Limiters |
|---|---|
| Accessories | Load Side Lugs Included, Amp-trap Current Limiters |
| Standards | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Fused Protection, Interchangeable Trip Unit |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
5 answersWhich Siemens equipment is compatible with the CM3B500 circuit breaker?
This bolt-on breaker is designed for installation in Siemens switchboards, motor control centers, and power panelboards that accept C-frame molded case circuit breakers.
What are the wire size requirements for the load side lugs on this breaker?
The factory-installed load side lugs accommodate three conductors per phase, accepting wire sizes from 1/0 AWG up to 500 kcmil. Ensure proper torque specifications are followed during installation.
How does the current-limiting feature of the CM3B500 benefit the electrical system?
As a current-limiting breaker, it clears faults extremely fast. This significantly reduces the peak let-through current and thermal energy, providing enhanced protection for downstream circuits and equipment.
Does the CM3B500 feature an interchangeable trip unit?
Yes. The CM frame utilizes an interchangeable thermal-magnetic trip unit. This allows panel builders to swap the trip unit to a different amperage rating without replacing the entire breaker block.
Can the instantaneous trip response be adjusted on this model?
Yes. While the thermal long-time protection is fixed at 500 amps, the magnetic instantaneous trip is adjustable. This allows electricians to coordinate the breaker with specific inrush currents or downstream devices.
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