Siemens / ITE CM3B800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Bolt-On
Quantity
Siemens / ITE CM3B800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Part of the legacy CM3B series, the Siemens CM3B800 is a 3-pole, 800A molded case circuit breaker. It delivers robust protection for switchboards and motor control centers. This bolt-on breaker serves as an exact replacement for aging infrastructure, ensuring seamless panel compatibility. It is replaced by the CMD63B800 for modern upgrades. Featuring a thermal-magnetic trip, it provides reliable LI protection.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CM3B800-R |
| Series | CM3B |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 100kA @ 480VAC, 65kA @ 600VAC |
| 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
8 answersWhat does the Cordon designation mean on the CM3B800?
Cordon circuit breakers are current limiting devices. They utilize integral current limiting fuses within the molded case to achieve high interrupting ratings and protect downstream equipment from severe short circuits.
Is the CM3B800 an ITE or Siemens breaker?
ITE was acquired by Siemens, so this legacy C-Frame breaker can be found with either ITE or Siemens branding. Both versions are physically and electrically identical and serve as exact replacements for each other.
What is the modern replacement for the legacy CM3B800?
For modern panel upgrades, the CM3B800 is typically replaced by the CMD63B800 molded case circuit breaker.
How many conductors do the standard lugs on the CM3B800 accept?
The standard lugs are designed to accept three conductors per phase, accommodating wire sizes from 1/0 AWG up to 500 kcmil.
How is the CM3B800 installed in a switchboard?
It is a bolt-on circuit breaker, requiring bolted connections directly to the busbar. It is designed for secure installation in compatible Siemens or ITE switchboards, motor control centers, and power panelboards.
How is the trip unit configured on the CM3B800?
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 the CM3B800 be used in standard load centers?
No, this is a large C-Frame molded case circuit breaker designed specifically for heavy-duty commercial and industrial applications, including Siemens switchboards, motor control centers, and power panelboards.
What does the LI trip function code indicate on this breaker?
The LI designation means the breaker provides Long-Time (L) overload protection and Instantaneous (I) short-circuit protection, which are standard functions for thermal-magnetic trip units.
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