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Square D 989316 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Square D
989316
Molded Case Circuit Breaker
Brand
Square D
SKU
989316
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Square D 989316 - 100A 3 Pole Molded Case Circuit Breaker
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Description
Restoring older electrical systems, the Square D 989316 is a 100A, three-pole molded case circuit breaker. It belongs to the legacy ML-1 series for commercial use. This breaker mounts into compatible ML-1 panelboards using a bolt-on connection. It is built for three-phase applications and accepts 3-1/0 AWG wiring via included lugs. Rated 10kAIC at 240VAC, the unit employs fixed thermal-magnetic trip elements to deliver reliable long-time and instantaneous fault protection.Specifications
| Brand | Square D |
|---|---|
| Part Number | 989316-R |
| Series | 989 |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML-1 Panelboards |
| Wire Gauge | 3-1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 3 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
7 answersWill the 989316 breaker fit standard Square D NQ or NF panelboards?
No. This breaker is built on the legacy 99 Frame and is exclusively compatible with older Square D ML-1 panelboards. It will not mount in modern NQ, NQOD, or NF series panels.
What does the 99 Frame designation indicate for the 989316?
The 99 Frame refers to the specific physical dimensions and mounting footprint used by legacy Square D ML-1 series breakers. This ensures proper alignment and phase spacing when bolted to the busbars in compatible ML-1 panelboards.
How is the 989316 secured within the panelboard?
It utilizes a bolt-on mounting configuration. This requires bolting the breaker directly to the ML-1 panel bus, ensuring a secure, vibration-resistant connection for three-phase applications.
What are the wire size limits for the load lugs on this breaker?
The factory-installed lugs accept wire gauges ranging from 3 AWG up to 1/0 AWG. Installers must verify proper torque specifications based on the wire material and size used.
Is the Square D 989316 breaker still in active production?
No, the ML-1 series and 99 Frame breakers are obsolete and have been discontinued by Schneider Electric. They are primarily sourced to maintain and service existing legacy panelboards without requiring a complete system retrofit.
How does the trip unit on the 989316 operate during a fault?
It features a fixed thermal-magnetic trip unit with LI functions. The thermal element provides long-time protection by tripping during sustained overloads, while the magnetic element provides instantaneous protection to clear severe short circuits.
Can the 989316 be installed in systems with high available fault currents?
This breaker has an interrupting capacity of 10kA at 240V AC. It must not be installed in systems where the available fault current exceeds its rated capacity at the operating voltage, and a short-circuit study should be verified prior to installation.
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