Square D 997370 Circuit Breaker
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Core Specs
See full specsSquare D 997370 3 Pole Circuit Breaker
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Description
Square D 997370 3 Pole Circuit Breaker
The Square D 997370 is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 70 Amps and a voltage rating of 600VAC. It has an interrupting rating of 10kAIC at 600V. The 997370 has a bolt-on connection type and includes long time and instantaneous trip functions.
Specifications
| Brand | Square D |
|---|---|
| Series | 997 |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 600VAC |
| Frame Type | ML-3 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D Type ML Panelboards |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Temp Rating | 40 °C |
|---|
Product FAQs
6 answersWhat panelboards are compatible with the Square D 997370 circuit breaker?
The 997370 is a Type 997, ML-3 frame molded case circuit breaker designed specifically to fit into legacy Square D Type ML panelboards.
How is the 997370 breaker installed into the panelboard?
This breaker features a bolt-on connection. It must be mechanically fastened directly to the panelboard busbar using bolts, which provides a secure, vibration-resistant connection suitable for commercial and industrial environments.
What type of protection does the thermal-magnetic trip unit provide?
The thermal-magnetic mechanism offers dual protection. The thermal element provides long-time delay protection against sustained overloads, while the magnetic element provides instantaneous protection against severe short circuits.
What does the 10kAIC rating mean for system safety?
The 10kAIC rating indicates that the breaker can safely interrupt up to 10,000 amps of fault current at 600VAC without sustaining internal damage. You must verify that your system's maximum available fault current does not exceed this limit to ensure safe operation.
Is the 997370 part of a specific frame family?
Yes, the 997370 is part of the legacy Square D 99 Series and is built on the ML-3 frame, also known as Type 997. It is commonly used as a direct replacement for older ML series breakers to maintain existing electrical infrastructure.
Can this 3-pole breaker be used on a single-phase system?
While designed for three-phase systems, 3-pole molded case circuit breakers can often be applied in single-phase applications by wiring across two poles. Always consult a licensed electrician and local electrical codes to ensure proper and safe installation.
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