Siemens BQCH3B070 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Quantity
Siemens BQCH3B070 - 70A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to safeguard commercial circuits, this 70A Siemens molded case circuit breaker provides essential thermal-magnetic protection. The three-pole unit is fully compatible with Siemens P1, P2, and P3 panelboards, making it ideal for standard distribution applications. The bolt-on mounting style guarantees a firm connection to the busbar. For maintenance planning, this breaker is commonly substituted by the newer BQD370 model.Specifications
| Brand | Siemens |
|---|---|
| Part Number | BQCH3B070-R |
| Series | BQCH |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480Y/277VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 14kA @ 480Y/277VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 8-1 AWG (Cu), 6-1/0 AWG (Al) |
| Max Wire | 1 AWG (Cu), 1/0 AWG (Al) |
| Min Wire | 8 AWG (Cu), 6 AWG (Al) |
| 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, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR Rated, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40°C |
| Construction Features | HACR Rated, Common Trip, Non-Interchangeable Trip, Quick-Make/Quick-Break, Trip-Free Mechanism |
Product FAQs
7 answersWhich panelboards accept the Siemens BQCH3B070 circuit breaker?
This 3-pole breaker is engineered specifically for bolt-on installation in Siemens P1, P2, and P3 commercial panelboards.
What is the recommended modern replacement for the legacy BQCH3B070?
For panel upgrades or maintenance, the BQCH3B070 is commonly substituted by the newer Siemens BQD370 circuit breaker, which serves as a direct drop-in replacement for P1, P2, and P3 panelboards.
What type of mounting connection does this breaker require?
The BQCH3B070 utilizes a bolt-on mounting configuration, requiring it to be physically bolted to the panelboard busbar for a secure, vibration-resistant electrical connection.
What are the acceptable wire gauges for the load lugs on the BQCH3B070?
The factory-installed load side lugs accommodate 8 to 1 AWG copper (Cu) conductors or 6 to 1/0 AWG aluminum (Al) conductors.
How does the interrupting rating scale with system voltage on this breaker?
The breaker provides a high interrupting capacity of 65kA when applied on 240V AC systems, which scales down to a standard 14kA rating when used on 480V or 277V AC systems.
Can the trip settings on the BQCH3B070 be adjusted in the field?
No, both the thermal and magnetic trip functions on this molded case circuit breaker are fixed and cannot be field adjusted.
How does the thermal-magnetic trip mechanism operate on this unit?
The breaker utilizes a fixed thermal element to protect against sustained overloads (long-time) and a fixed magnetic element to instantly clear severe short circuits (instantaneous), ensuring comprehensive circuit protection.
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