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Siemens E43B050 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Siemens
E43B050
Molded Case Circuit Breaker
Brand
Siemens
SKU
E43B050
Quantity
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Siemens E43B050 - 50A 3 Pole Molded Case Circuit Breaker
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Description
Designed to protect commercial power systems, the Siemens E43B050 functions as a 50A, 3-pole molded case circuit breaker. It features a non-interchangeable thermal-magnetic trip unit that provides precise long-time and instantaneous protection. The bolt-on connection ensures a secure fit in Siemens Sentron panelboards, SB switchboards, and older ITE F-Series panels. Delivering an interrupt capacity of 18 kAIC at 480VAC, it is HACR rated and reverse-feed capable for flexible installation.Specifications
| Brand | Siemens |
|---|---|
| Part Number | E43B050-R |
| Series | E4 |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 30kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens Sentron Panelboards, SB Switchboards, ITE F-Series Panelboards |
| 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 Lugs (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, HACR, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Reverse Feed, Non-Interchangeable Trip |
Product FAQs
7 answersWhich panelboards and switchboards accept the Siemens E43B050 breaker?
This E-frame breaker is designed for use in Siemens Sentron panelboards, SB switchboards, and legacy ITE F-Series panelboards. It requires a bolt-on connection to the bus.
What wire sizes are accepted by the load side lugs on the E43B050?
The factory installed load lugs accept copper or aluminum conductors ranging from 10 AWG to 1/0 AWG. Ensure proper torque specifications are followed during installation as outlined on the breaker faceplate.
Can the E43B050 be used in DC electrical systems?
Yes, in addition to its AC ratings, this thermal magnetic breaker is rated for direct current applications up to 250VDC, delivering a 30kA interrupting capacity.
Can I use the Siemens E43B050 to replace an older ITE E43B050 breaker?
Yes, Siemens acquired ITE and continued manufacturing this E-frame series. The Siemens E43B050 is the direct replacement for the legacy ITE E43B050, maintaining the same physical dimensions and bolt-on mounting style.
What type of trip unit is installed in the E43B050?
It features a non-interchangeable thermal magnetic trip unit with fixed thermal and fixed magnetic settings, providing both long-time and instantaneous protection for the circuit.
Is the E43B050 suitable for reverse feed applications?
Yes, this molded case circuit breaker is reverse feed capable, allowing for flexible wiring configurations in commercial power systems.
What safety precautions should be taken before installing the E43B050?
Always verify that the panelboard or switchboard is completely de-energized and follow standard lockout and tagout procedures before attempting to bolt the breaker to the bus.
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