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Square D 989750 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Square D
989750
Molded Case Circuit Breaker
Brand
Square D
SKU
989750
Quantity
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Square D 989750 - 50A 3 Pole Molded Case Circuit Breaker
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Description
Delivering robust performance for commercial applications, the Square D 989750 is a 3-pole, 50A molded case circuit breaker. It features fixed thermal and magnetic trip elements to supply dependable long-time and instantaneous (LI) protection. This bolt-on breaker fits into legacy Square D ML-1 panelboards, making it ideal for maintaining older systems. Providing a 10 kAIC rating at 480VAC, this 99 frame breaker keeps existing infrastructure operational without extensive retrofitting.Specifications
| Brand | Square D |
|---|---|
| Part Number | 989750-R |
| Series | 989 |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 480VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 480VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML-1 Panelboards |
| Wire Gauge | 8-1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40°C |
| Construction Features | Legacy ML-1 Frame |
Product FAQs
6 answersWhat panelboards are compatible with the Square D 989750 circuit breaker?
This breaker is designed specifically for legacy Square D ML-1 series panelboards. It uses a bolt-on mounting configuration and is not compatible with modern I-Line, NQ, or NQOD panels.
What wire sizes are accepted by the lugs on the 989750 breaker?
The included lugs accept wire gauges from 8 AWG up to 1/0 AWG. Ensure you use properly sized conductors according to the 50A circuit requirements and local electrical codes.
Is the Square D 989750 still actively manufactured?
No, the 989 series and ML-1 frame breakers are obsolete and no longer in active production by Schneider Electric. They are utilized primarily to maintain and service existing legacy electrical systems.
Can the trip settings on the 989750 be adjusted for specific coordination?
No, this breaker features fixed thermal and fixed magnetic trip elements. The long-time and instantaneous (LI) trip functions are factory set for 50A protection and cannot be field adjusted.
What does the LI trip function code mean on this breaker?
The LI designation indicates that the thermal-magnetic trip unit provides Long-Time (L) overload protection and Instantaneous (I) short circuit protection. Both of these parameters are fixed on the 989750 model.
What is the maximum fault current this breaker can safely interrupt at 480V?
The 989750 has a maximum interrupting rating of 10,000 Amps (10kAIC) at 480VAC. Do not install this breaker in systems where the available fault current exceeds this rating, as it could compromise safety during a short circuit.
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