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Siemens / ITE CF3B070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Siemens / ITE
CF3B070
Molded Case Circuit Breaker
Brand
Siemens / ITE
SKU
CF3B070
Quantity
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Siemens / ITE CF3B070 - 70A 3 Pole Molded Case Circuit Breaker
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Description
Providing advanced short-circuit defense, the Siemens CF3B070 is a 3-pole, 70A current-limiting molded case circuit breaker. It utilizes thermal-magnetic trip technology and delivers a 200kAIC interrupting capacity at 480VAC. This bolt-on MCCB mounts into compatible Siemens switchboards and motor control centers. It serves as an exact legacy replacement for older C-Frame breakers, while the CED63B070 is its modern substitute. Built-in Amp-Trap fuses actively restrict let-through energy.Specifications
| Brand | Siemens / ITE |
|---|---|
| Part Number | CF3B070-R |
| Series | CF |
| Amperage | 70A |
| 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, Alarm Switch, Line Side Lugs |
|---|---|
| Accessories | Load Side 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
7 answersWhat type of equipment is the CF3B070 breaker designed to fit?
This bolt-on C-Frame breaker is specifically designed for installation in Siemens or legacy ITE switchboards and motor control centers.
Are ITE and Siemens CF3B070 breakers interchangeable?
Yes. Siemens acquired the ITE electrical distribution division, so breakers labeled under either the Siemens or ITE brand with the CF3B070 catalog number are the exact same physical and electrical component.
How does the current limiting feature of the CF3B070 benefit an electrical system?
Current limiting breakers clear short circuits in less than a half cycle. This rapid response significantly reduces the peak let-through current and energy, protecting downstream components from severe thermal and magnetic stress during a fault.
How does the interrupting capacity change based on system voltage?
The breaker provides a high interrupting capacity of 200kA at 240VAC and 480VAC. However, for 600VAC and 250VDC applications, the maximum interrupting rating drops to 100kA. Always verify your system's available fault current does not exceed these limits.
What wire sizes and materials are compatible with the factory lugs?
The standard lugs accommodate copper conductors from 14 to 1/0 AWG and aluminum conductors from 12 to 1/0 AWG. Ensure proper torque specifications are applied during installation to prevent thermal issues.
Does this breaker feature adjustable trip settings?
No, the CF3B070 utilizes a fixed thermal and fixed magnetic trip unit. It provides standard long-time and instantaneous (LI) protection without user-adjustable dials.
Is this breaker suitable for direct current (DC) applications?
Yes, it is rated for DC applications up to 250VDC. When installing in a DC system, ensure the available fault current does not exceed its 100kA DC interrupting rating.
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