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Square D 999320 Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Square D
999320
Molded Case Circuit Breaker
Brand
Square D
SKU
999320
Quantity
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Square D 999320 - 20A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Description
Designed for older commercial applications, this 20-amp molded case circuit breaker provides essential overcurrent defense. The 3-pole configuration utilizes proven thermal-magnetic trip technology to handle overloads and short circuits effectively. The bolt-on design ensures a secure connection within obsolete Square D ML panelboards and motor control centers. It allows facilities to safely extend the lifespan of their current electrical hardware.Specifications
| Brand | Square D |
|---|---|
| Part Number | 999320-R |
| Series | 999 |
| Amperage | 20A |
| 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 |
| Standards | UL 489 |
|---|---|
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | Obsolete |
Product FAQs
5 answersWhich panelboards accept the Square D 999320 circuit breaker?
This legacy 99 Series breaker is specifically designed to mount into obsolete Square D ML panelboards and Square D Motor Control Centers. It is not compatible with modern NF or NQ series panels.
How is the 999320 secured inside the panelboard?
It utilizes a bolt-on mounting configuration. This provides a secure, vibration-resistant connection to the busbar, which is especially important in motor control center applications.
How does the trip unit function on this 99 Series breaker?
The breaker features a thermal-magnetic trip unit with fixed thermal and fixed magnetic settings. This provides standard long-time (L) and instantaneous (I) protection against overloads and short circuits without the need for field adjustments.
What frame size or series does the 999320 belong to?
It is part of the Square D 99 Frame group, often referred to as the 99 Series or Type ML breakers, which were manufactured for older commercial and industrial distribution systems.
What type of load connections are provided on this breaker?
The breaker comes equipped with standard mechanical lugs for terminating the load conductors.
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