Siemens BG3B020 Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Siemens
BG3B020
Molded Case Circuit Breaker
Brand
Siemens
SKU
BG3B020
Quantity
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Siemens BG3B020 - 20A 3 Pole Molded Case Circuit Breaker
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Description
Part of the Siemens Sentron line, the BG3B020 is a 20A bolt-on circuit breaker built for industrial electrical systems. Its defining feature is a switching neutral mechanism, providing an extra layer of safety by severing the neutral connection alongside the hot legs during a fault. This breaker mounts into Siemens panelboards and occupies three standard spaces. Cross-referenced to the BQ3B020 for newer installations, it delivers a 10kAIC interrupt rating and includes an HACR certification.Specifications
| Brand | Siemens |
|---|---|
| Series | BG |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | BQ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Panelboards |
| Wire Gauge | 14-6 AWG (Cu/Al) |
| Max Wire | 6 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Switching Neutral, HACR Rated, Common Trip |
Product FAQs
7 answersWhich panelboards are compatible with the BG3B020 circuit breaker?
The BG3B020 is a BQ frame bolt-on breaker designed for use in Siemens commercial panelboards. It is also compatible with legacy ITE panelboards that specifically list BQ or BG frame breakers on their interior UL label. Always verify your panel's compatibility chart before installation.
How is the BG3B020 secured to the panelboard?
This breaker utilizes a bolt-on mounting style. Instead of snapping onto the bus bar, it bolts directly to the panelboard bus, providing a secure, high-retention electrical connection ideal for commercial and industrial environments subject to vibration.
What does the thermal-magnetic trip unit on the BG3B020 protect against?
The fixed thermal-magnetic (LI) trip unit provides two types of protection. The thermal element (Long-Time) protects against sustained overloads, while the magnetic element (Instantaneous) trips the breaker immediately in the event of a severe short circuit.
What type of wire can be used with the BG3B020 terminals?
The factory-installed lugs accept both copper (Cu) and aluminum (Al) conductors ranging from 14 AWG to 6 AWG. Ensure proper torque specifications are followed during installation to maintain a secure connection and prevent overheating.
Can I install this bolt-on breaker in a standard residential load center?
No. The BG3B020 is a bolt-on breaker intended for commercial panelboards. Standard residential load centers typically require plug-on breakers, such as the Siemens QP series, and do not have the threaded bus bars required to accept bolt-on connections.
Why is it important to match the 10kAIC rating of the BG3B020 to my panel?
The 10kAIC rating indicates the maximum fault current the breaker can safely clear at 120/240VAC. Installing this breaker in a system with an available fault current higher than 10,000 amps can result in catastrophic failure, equipment damage, or fire hazards.
What is the purpose of the switching neutral feature on the BG3B020?
The BG series features a switching neutral mechanism that severs the neutral connection alongside the hot legs during a fault or manual disconnect. This is required in specific applications, such as fuel dispensing equipment, where all conductors must be completely disconnected for safety.
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