Schneider Electric / Square D FI26100AB Molded Case Circuit Breaker
- 100A
- 2 Pole
- I-Line
Quantity
Schneider Electric / Square D FI26100AB - 100A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for heavy-duty industrial environments, the Square D FI26100AB is a 100A, two-pole current-limiting MCCB. It restricts let-through energy during short circuits to protect downstream equipment. This legacy F-frame breaker utilizes an A-B phase connection and installs into Square D I-Line panelboards. It is replaced by the HLA261001, which has a reduced 100kAIC rating at 480V. Delivering a 200kAIC capacity at 480V, it uses thermal-magnetic trip technology for dependable fault response.Specifications
| Brand | Schneider Electric / Square D |
|---|---|
| Part Number | FI26100AB |
| Series | FI |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 600VAC |
| Phase | 1 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 100kA @ 600VAC |
| Frame Type | F |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards |
| Wire Gauge | 14-1/0 AWG (Cu), 12-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Phase Connection A-B |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Visual Trip Indicator |
| Special Features | Current Limiting |
Product FAQs
7 answersWhat does the AB suffix in the FI26100AB catalog number indicate?
The AB suffix specifies the phase connection for the I-Line plug-in mounting. It indicates that this 2-pole breaker connects to the A and B phases on the panelboard busbar.
What panelboards are compatible with the FI26100AB circuit breaker?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It mounts directly to the internal I-Line bus assembly.
How does the I-Line plug-in connection work under fault conditions?
The I-Line mounting system uses a blow-on jaw design. During a high-level short circuit, the magnetic forces generated by the fault current force the jaws tighter against the busbar, ensuring a secure electrical connection.
Is the Square D FI frame still in active production?
The F-frame is a legacy product and is no longer manufactured by Schneider Electric. For new installations or direct replacements, the PowerPact B or H-frame series is the modern equivalent, though specific I-Line adapter requirements may apply.
What makes the FI26100AB a current-limiting circuit breaker?
Current-limiting breakers like the FI series are designed to clear severe short circuits extremely fast, typically within a half-cycle. This rapid response limits the peak let-through current and thermal energy delivered to downstream equipment during a fault.
What is the recommended tightening torque for the load-side lugs?
For the standard AL100FA lugs used on 100A F-frame breakers, the recommended terminal tightening torque is 50 lb-in (5.6 N.m) for 14 to 1/0 AWG conductors.
Can the trip settings on the FI26100AB be adjusted in the field?
No, the thermal-magnetic trip unit is fixed. The long-time and instantaneous trip thresholds are factory set and cannot be modified in the field.
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