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Siemens HED42B045 Molded Case Circuit Breaker
- 45A
- 2 Pole
- Bolt-On
Siemens
HED42B045
Molded Case Circuit Breaker
Brand
Siemens
SKU
HED42B045
Quantity
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Siemens HED42B045 - 45A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Siemens HED42B045 - 45A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | HED42B045 |
| Series | HED4 |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 42kA @ 480VAC, 30kA @ 250VDC |
| Frame Type | HED |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards, SB Switchboards, Motor Control Centers |
| Wire Gauge | 10-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 10 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed, Non-Interchangeable Trip |
Sold out
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Siemens HED42B045 - 45A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | HED42B045-R |
| Series | HED4 |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 42kA @ 480VAC, 30kA @ 250VDC |
| Frame Type | HED |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards, SB Switchboards, Motor Control Centers |
| Wire Gauge | 10-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 10 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed, Non-Interchangeable Trip |
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Description
Designed to safeguard commercial electrical systems, this 45-amp thermal-magnetic breaker offers reliable long-time and instantaneous trip functions. It carries a robust 42kA interrupting capacity at 480VAC. The bolt-on mounting style ensures a secure connection within Siemens Sentron panelboards, SB switchboards, and MCCs. When upgrading older systems, note that its modern replacement, the 3VA5145-6ED21-0AA0, requires a specific mounting kit.Specifications
| Brand | Siemens |
|---|---|
| Part Number | HED42B045 |
| Series | HED4 |
| Amperage | 45A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 42kA @ 480VAC, 30kA @ 250VDC |
| Frame Type | HED |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards, SB Switchboards, Motor Control Centers |
| Wire Gauge | 10-1/0 AWG (Cu/Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 10 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens HED42B045?
This ED-frame breaker is designed for use in Siemens Sentron panelboards, SB switchboards, and Siemens Motor Control Centers. It requires a bolt-on connection to the bus.
Can the HED42B045 be used in DC electrical systems?
Yes, this thermal-magnetic breaker is rated for DC applications up to 250VDC, where it provides an interrupting capacity of 30kAIC.
Is the Siemens HED42B045 HACR rated?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment motor loads.
What is the difference between the HED42B045 and standard ED4 breakers?
The HED42B045 is the high-interrupting version of the 45A ED frame, offering 42kAIC at 480VAC. Standard ED4 breakers share the same physical dimensions but have a lower interrupting capacity.
What replacement lug kit is required for the HED42B045?
The standard replacement lug kit for this 45A ED-frame breaker is the Siemens LN1E100. These lugs accept 10 to 1/0 AWG copper or aluminum conductors.
Does the HED42B045 include adjustable trip settings?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous trip settings cannot be adjusted in the field.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 13 reviews.
Total 5 star reviews: 13 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
13 reviews
- PMPete M.Verified BuyerReviewingSiemens HED43B060 - 60A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/19/26Good price - Best website
Awesome price on an item. easy to use website made finding the right breaker and purchasing it super easy
- BCBrad C.Verified BuyerReviewingSiemens HED43B070 - 70A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars5/12/26Thank You
The breaker works perfectly, but I'm more impressed by the fast, prompt delivery. Will be using you again, thank you.
- MLMichael L.Verified BuyerReviewingSiemens HED43B020 - 20A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/15/26Siemens breaker
Return customer, always great service and quick delivery. A+++
- JMJonathan M.Verified BuyerReviewingSiemens HED43B030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/10/26Breaker
Fast Delivery, just what I ordered !!
- RFRussell F.Verified BuyerReviewingSiemens HED41B040 - 40A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars2/6/26Just what I ordered
Straight forward, simple process. On time delivery.