Square D 989270 Molded Case Circuit Breaker
- 70A
- 2 Pole
- Bolt-On
Quantity
Square D 989270 - 70A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
The 989270 is a legacy ML-1 frame molded case circuit breaker by Square D. Built for commercial applications, this two-pole unit delivers 70A of continuous current capacity. It installs into older ML-1 panelboards that utilize a bolt-on mounting configuration. The breaker accepts 4-1/0 AWG wire and includes load side lugs for straightforward wiring. Rated 10kAIC at 240VAC, it utilizes fixed thermal and magnetic trip technology to defend against overloads and short circuits.Specifications
| Brand | Square D |
|---|---|
| Part Number | 989270-R |
| Series | 989 |
| Amperage | 70A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML-1 Panelboards |
| Wire Gauge | 4-1/0 AWG |
| Max Wire | 1/0 AWG |
| Min Wire | 4 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 answersWhich panelboards accept the Square D 989270 circuit breaker?
This legacy breaker is engineered specifically for use in Square D ML-1 panelboards. It utilizes a bolt-on mounting configuration to integrate securely into these older commercial distribution systems.
The description mentions 480V, but the specifications list 240VAC. What is the correct voltage rating for the 989270?
The 989270 is strictly rated for a maximum of 240VAC. It provides a 10kA interrupting capacity at this voltage and must not be installed in 480V systems.
How does the thermal-magnetic trip unit function on this 70A breaker?
The 989270 features a fixed LI (Long-Time, Instantaneous) trip mechanism. The thermal component responds to prolonged overloads by heating a bimetallic strip, while the magnetic component reacts immediately to high-fault short circuits up to its 10kAIC rating.
What are the wiring requirements for the load-side lugs on the 989270?
The factory-installed lugs accept wire gauges ranging from 4 AWG to 1/0 AWG. When terminating conductors, ensure the wire size is appropriately rated for the 70A continuous load in accordance with the National Electrical Code (NEC).
Is the Square D ML-1 breaker series still actively manufactured?
The ML-1 frame is a legacy product line that has been discontinued by Schneider Electric. Breakers like the 989270 are sourced to service and maintain existing older panelboards, preventing the need for a complete system retrofit.
Can this breaker be used in systems with a high available fault current?
The 989270 has a maximum interrupting rating of 10kA at 240VAC. It must not be installed in electrical systems where the available fault current exceeds this threshold, as doing so poses a severe safety hazard and violates electrical codes.
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