Square D IF34040-1021 Molded Case Circuit Breaker
- 40A
- 3 Pole
- I-Line
Quantity
Square D IF34040-1021 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for heavy-duty industrial environments, this 40A, 3-pole current-limiting MCCB provides reliable thermal-magnetic protection. It includes a built-in 120VAC shunt trip, allowing for remote circuit interruption when required. This breaker mounts into Square D I-Line panelboards. If a modern equivalent is needed, it can be replaced by the HRA36040 along with the S29386 shunt trip accessory. With a massive 200 kAIC interrupt rating at 480VAC, it restricts peak fault currents effectively.Specifications
| Brand | Square D |
|---|---|
| Part Number | IF34040-1021-R |
| Series | IF |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC |
| 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 Thermal, Fixed Magnetic |
| Available Options | Auxiliary Switch, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Shunt Trip (120VAC) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, HACR Rated, Common Trip, Trip-Free Mechanism |
| Special Features | Current Limiting |
Product FAQs
6 answersIs the Square D IF34040-1021 still actively manufactured?
The IF-frame is a legacy circuit breaker that has been discontinued by Square D. For modern upgrades or direct replacements, this model crosses over to the PowerPact H-frame series, specifically catalog number HRA36040.
What type of panelboards will accept the IF34040-1021?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes a plug-on phase connection that mounts directly to the I-Line bus stack.
What does the current limiting designation mean for this IF-frame breaker?
As part of the Square D I-Limiter series, this breaker is engineered to clear faults extremely fast, actively restricting peak let-through current and energy. This protects downstream equipment from severe mechanical and thermal stress during a short circuit.
How does the I-Line mounting system work on the IF34040-1021?
The breaker features a plug-on design with blow-on joint technology. The jaws grip the panelboard bus bars tighter during high-fault conditions, ensuring a secure electrical connection while allowing for rapid installation without bus bolting.
Does this breaker provide adjustable trip settings?
No, the IF34040-1021 features a thermal-magnetic trip unit with fixed long-time and fixed instantaneous trip functions. It does not offer adjustable dials for field calibration.
How does the 200kAIC rating benefit my electrical system?
The 200,000 Ampere Interrupting Capacity at 480VAC ensures the breaker can safely interrupt massive fault currents without sustaining catastrophic damage, making it suitable for heavy industrial environments with high available fault current.
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