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Square D 999370 Molded Case Circuit Breaker
- 70A
- 3 Pole
- Bolt-On
Square D
999370
Molded Case Circuit Breaker
Brand
Square D
SKU
999370
Quantity
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Square D 999370 - 70A 3 Pole Molded Case Circuit Breaker
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Description
Built to support legacy commercial infrastructure, the Square D 999370 delivers 70 amps of reliable power distribution. This 3-pole MCCB belongs to the obsolete 999 series, offering a crucial maintenance solution. Designed with a sturdy bolt-on configuration, it installs seamlessly into Square D ML panelboards and motor control centers. Facility managers rely on this exact Type ML-1 replacement to keep existing enclosures operational.Specifications
| Brand | Square D |
|---|---|
| Part Number | 999370-R |
| Series | 999 |
| Amperage | 70A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML Panelboards, Square D Motor Control Centers |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | UL 489 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | Type ML-1, Obsolete/Legacy |
Product FAQs
6 answersWhat equipment is the Square D 999370 designed to fit?
This legacy 999 series breaker is specifically designed for use in vintage Square D ML panelboards and compatible Square D motor control centers.
Is the 999370 known by a specific breaker type designation?
Yes, the 999370 is classified as a legacy Type ML-1 molded case circuit breaker.
Does the 999370 require a specific mounting configuration?
It utilizes a standard bolt-on connection to secure directly to the busbars of compatible ML panelboards, ensuring a reliable connection for 600VAC industrial applications.
Can I adjust the trip curve on the 999370 breaker?
No, this breaker is equipped with a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous (LI) trip functions are factory-set and cannot be adjusted in the field.
What type of wire connections does the 999370 accept?
The breaker is equipped with standard lug terminals for secure wire termination. Ensure all connections are properly torqued to the manufacturer specifications during installation.
Is the 999370 suitable for systems with high fault currents?
The 999370 has a maximum interrupting rating of 10kA at 600VAC. It must only be installed in systems where the available fault current does not exceed this threshold to ensure safe operation.
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