Square D 992350 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Quantity
Square D 992350 - 50A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for commercial and industrial power distribution, the Square D 992350 is a 3-pole, 50A molded case circuit breaker. It features standard long-time and instantaneous (LI) protection to defend against overloads and short circuits. This unit features a bolt-on mounting style designed specifically for legacy Square D ML panelboards. It provides facility managers with a reliable replacement option to maintain older 99 Series electrical systems. Delivering a 10kA interrupting rating at 240VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | 992350-R |
| Series | 99 Series |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML Panelboards |
| Wire Gauge | 8-2 AWG (Cu), 8-2 AWG (Al) |
| Max Wire | 2 AWG |
| Min Wire | 8 AWG |
| 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, NEMA AB-1 |
| Approval | UL, CSA |
| Temp Rating | 40°C |
Product FAQs
7 answersWhat type of panelboard requires the Square D 992350 circuit breaker?
This specific 99 Series breaker is engineered for legacy Square D ML panelboards. It is used to distribute 3-phase power and protect circuits within these older commercial distribution systems.
How is the 992350 breaker secured inside the panelboard?
It utilizes a bolt-on mounting configuration. The breaker must be mechanically fastened directly to the busbars of an ML panelboard, ensuring a tight, vibration-resistant connection for 3-phase loads.
What are the wire gauge requirements for the terminal lugs on this breaker?
The built-in lugs are rated for 8 AWG to 2 AWG conductors. They are dual-rated, meaning they safely accept either copper or aluminum wiring.
How does the thermal-magnetic trip unit function on the 992350?
The breaker uses a fixed thermal element to protect against prolonged overloads (Long-Time) and a fixed magnetic element to instantly clear severe short circuits (Instantaneous). Neither the thermal nor the magnetic settings are adjustable.
Is the 10kAIC rating sufficient for commercial applications?
A 10kA interrupting capacity at 240VAC is standard for many light commercial and industrial subpanels. However, you must verify that the available fault current at the ML panelboard does not exceed 10,000 amps before installing this breaker.
Is the 992350 part of a current Square D product line?
No, this breaker belongs to the legacy 99 Series. It is specifically sourced to maintain and service older Square D ML panelboards that cannot accept modern frame types without retrofitting.
What safety precautions are necessary when installing a bolt-on breaker like the 992350?
Because bolt-on breakers require physical fastening to the busbars, the panelboard must be completely de-energized before installation or removal. Only qualified electricians should perform this work to prevent arc flash hazards.
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