Siemens E42B020 Molded Case Circuit Breaker
- 20A
- 2 Pole
- Bolt-On
Quantity
Siemens E42B020 - 20A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Constructed for industrial power distribution, this 20-amp, two-pole circuit breaker utilizes fixed thermal-magnetic trip technology. It provides a robust 18kAIC interrupt capacity at 480VAC and 65kAIC at 240VAC. Designed with a bolt-on mounting style, it integrates seamlessly into Siemens Sentron panelboards and motor control centers. For facilities upgrading their infrastructure, this legacy E4-Type model is officially replaced by the newer ED42B020.Specifications
| Brand | Siemens |
|---|---|
| Part Number | E42B020-R |
| Series | Type E4 |
| Amperage | 20A |
| 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 | 14-10 AWG (Cu), 12-10 AWG (Al) |
| Max Wire | 10 AWG |
| Min Wire | 14 AWG (Cu), 12 AWG (Al) |
| 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
6 answersWhich panelboards and enclosures are compatible with the E42B020 breaker?
This bolt-on E4 frame breaker is designed for use in Siemens Sentron panelboards, switchboards, and motor control centers.
Can the E42B020 be used in direct current (DC) applications?
Yes, this breaker is rated for DC systems up to 250VDC, providing an interrupting capacity of 30kAIC. This makes it suitable for specific industrial control and battery backup circuits.
Does the E42B020 require special lugs for aluminum wiring?
No, the factory-installed lugs are dual-rated for both copper (14-10 AWG) and aluminum (12-10 AWG) conductors. Standard industry practice requires applying an oxide-inhibiting joint compound when terminating aluminum wire.
What is the advantage of the bolt-on connection for the E42B020?
The bolt-on mounting secures the breaker directly to the panel busbars with screws. This creates a highly reliable, vibration-resistant connection that is ideal for heavy-duty industrial switchboards and motor control centers.
How does the thermal-magnetic trip unit function on the E42B020?
The fixed thermal-magnetic mechanism provides dual-level protection. A bimetallic element responds to sustained overloads (long-time protection), while an electromagnet trips the breaker immediately during severe short circuits (instantaneous protection).
Is the Siemens E42B020 a current production model?
The E42B020 is classified as a legacy MCCB. Exact replacements are sourced to maintain existing Sentron panelboards and motor control centers without requiring a complete system upgrade.
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