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Siemens / ITE CF3B040 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Siemens / ITE
CF3B040
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
CF3B040
Quantity
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Siemens / ITE CF3B040 - 40A 3 Pole Molded Case Circuit Breaker
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Description
Designed for heavy-duty industrial environments, the Siemens CF3B040 is a 3-pole, 40A current-limiting circuit breaker. It bolts into older Siemens switchboards and motor control centers, providing a seamless replacement solution. For modern upgrades, this unit crosses over to the CED63B040. Delivering a massive 200kAIC rating at 480VAC, it combines fixed thermal-magnetic protection with integral Amp-Trap fuses to drastically reduce let-through energy during severe short circuits.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CF3B040-R |
| Series | CF |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 100kA @ 600VAC, 100kA @ 250VDC |
| Frame Type | CF |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Switchboards, Motor Control Centers |
| Wire Gauge | 14-1/0 AWG (Cu), 12-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Amp-Trap Current Limiters, Line and Load Lugs Included |
| Standards | NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Integral Amp-Trap Fuses, High Interrupting Capacity |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
6 answersWhat equipment is the CF3B040 breaker designed to fit?
This CF-frame breaker is designed for bolt-on installation in Siemens and legacy ITE switchboards, as well as compatible motor control centers.
What wire sizes are accepted by the lugs on this breaker?
The factory-installed line and load side lugs accept 14 to 1/0 AWG copper wire or 12 to 1/0 AWG aluminum wire.
Why is this breaker listed as both Siemens and ITE?
Siemens acquired ITE and continued manufacturing many of their legacy designs. The CF3B040 is an authentic product that may carry either branding, but the physical and electrical characteristics remain identical.
Can this breaker be used in DC applications?
Yes, the CF3B040 is rated for use in DC circuits up to 250VDC, providing a 100kA interrupting capacity at that voltage.
What does the current limiting designation mean for this breaker?
As a current limiting breaker, it is designed to clear a fault in less than a half cycle. This significantly reduces the let-through energy, protecting downstream equipment from severe short-circuit damage.
Are the trip settings adjustable on the CF3B040?
No, this breaker features a non-interchangeable thermal magnetic trip unit with fixed long-time and instantaneous functions, meaning the trip thresholds cannot be modified in the field.
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