Eaton / Cutler-Hammer HFD3100S21 Molded Case Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Quantity
Eaton / Cutler-Hammer HFD3100S21 - 100A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for commercial and industrial applications, this 100-amp Series C breaker features a factory-installed shunt trip for remote tripping capabilities. It installs into standard Eaton switchboards and motor control centers requiring F-Frame dimensions. Delivering a robust 65kAIC interrupting rating at 480VAC, the unit provides reliable long-time and instantaneous protection. Note that this legacy model is officially replaced by the Power Defense PDG23M0100TFFJ series.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | HFD3100S21 |
| Series | HFD |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 25kA @ 600VAC, 22kA @ 250VDC |
| Frame Type | FD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Eaton Series C Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 14-1/0 AWG |
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed |
Product FAQs
8 answersWhat does the S21 suffix indicate on the HFD3100S21 catalog number?
The S21 suffix means the breaker includes a factory-installed shunt trip in the right pole. This shunt trip operates on 48 to 127 VAC or 48 to 60 VDC and comes with pigtail leads for control wiring.
Which Eaton enclosures are compatible with the HFD3100S21?
This F-Frame breaker is designed for installation in Eaton Series C panelboards, switchboards, and motor control centers.
What is the difference between an Eaton FD and HFD circuit breaker?
The HFD is the high interrupting capacity version of the standard FD frame. While they share the same physical dimensions, the HFD3100S21 provides a higher interrupting rating of 65kA at 480VAC, compared to 35kA for a standard FD breaker.
What size conductors are supported by the HFD3100S21 lugs?
The factory-installed lugs accept wire gauges from 14 AWG to 1/0 AWG. Always verify local codes for proper conductor sizing based on the 100-amp rating.
Are the trip settings on the HFD3100S21 adjustable for custom coordination?
No, this breaker features a thermal magnetic trip unit with fixed long time and fixed instantaneous settings. It cannot be dialed in for custom coordination requirements.
Can the HFD3100S21 be applied in 250VDC systems?
Yes, this breaker is rated for direct current applications up to 250VDC, where it provides an interrupting rating of 22kA.
Does the HFD3100S21 snap into the panelboard?
No, this is a bolt-on circuit breaker. It must be mechanically bolted to the busbar in compatible Eaton Series C panelboards or switchboards.
Does the HFD3100S21 provide ground fault protection?
No, this is a standard thermal magnetic breaker designed for overload and short circuit protection. It does not include integral ground fault or equipment protection features.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 21 reviews.
- CHcarl h.Verified BuyerReviewingEaton / Cutler-Hammer HFD3200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/20/26Breaker
Breaker shipped out and we received it super quick.
- DLDeanna L.Verified BuyerReviewingEaton / Cutler-Hammer HFD3150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/19/26Eaton / Cutler-Hammer HFD3150 - 150A 3 Pole Molded Case Circuit Breaker
We needed more breakers ASAP and once again, Michael David came thru like he always does. We are a 24/7/ emergency electrical restoration companyso most of our orders are always needed in a rush and SuperBreakers is always my go to!.
- RFRon F.Verified BuyerReviewingEaton / Cutler-Hammer HFD3045 - 45A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/9/26HFD3045
Perfect breaker & great price/delivery. It's very easy to schedule around SB as their projected delivery times are accurate.
- CPChristopher P.Verified BuyerReviewingEaton / Cutler-Hammer HFD3020L - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/13/26Fast and Cost effective
Superbreakers Is always my first palce to look for harder to source breakers for a good price, and fast turnaround.
- DSDavid S. B. D.Verified BuyerReviewingEaton / Cutler-Hammer HFD3060 - 60A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/6/26Breaker
Great response time and product