Siemens E42B040 Molded Case Circuit Breaker
- 40A
- 2 Pole
- Bolt-On
Quantity
Siemens E42B040 - 40A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Designed to protect commercial electrical systems, the Siemens E42B040 is a 40-amp, 2-pole molded case circuit breaker from the legacy E4 frame series. It delivers reliable thermal-magnetic trip functions with an interrupting capacity of 18kAIC at 480VAC and 65kAIC at 240VAC. The bolt-on design ensures a secure connection within older Siemens and ITE Sentron panelboards or motor control centers. When upgrading, this unit is replaced by the newer ED42B040 model.Specifications
| Brand | Siemens |
|---|---|
| Part Number | E42B040-R |
| Series | Type E4 |
| Amperage | 40A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 65kA @ 240VAC, 18kA @ 480VAC, 30kA @ 250VDC |
| Frame Type | E4 |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens Sentron Panelboards, 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 Included (LN1E100) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, HID Rated |
Product FAQs
5 answersWhat is the modern replacement for the legacy E42B040?
The E42B040 is part of the legacy E4 frame series. When upgrading or replacing this unit, the Siemens ED42B040 is the direct modern equivalent.
Which panelboards are compatible with the E42B040?
This breaker mounts via a bolt-on connection and is specifically designed for Siemens and legacy ITE Sentron panelboards, switchboards, and motor control centers. It is not compatible with standard residential plug-on load centers.
What conductor materials and sizes are supported by the E42B040 terminals?
The standard lugs accommodate 10 AWG through 1/0 AWG wire and are dual-rated for both copper and aluminum conductors. Always verify local electrical codes for proper wire sizing based on the 40-amp rating.
Can the E42B040 be used in DC electrical systems?
Yes, it is rated for up to 250VDC with a 30kAIC interrupting capacity. This makes it suitable for ungrounded or grounded DC systems, such as battery backups or industrial control panels, provided the voltage does not exceed 250VDC.
Does the E42B040 include adjustable trip settings?
No, this breaker features a fixed thermal and fixed magnetic trip unit. It provides standard long-time and instantaneous protection without adjustable dials, meaning the trip curve cannot be modified in the field.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.