The Siemens ED43B040L is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 40 Amps and a voltage rating of 480V. It has an interrupting rating of 18kAIC at 480V. The ED43B040L has a feed-thru connection type and includes long time and instantaneous trip functions.
Siemens P1, P2, P3, P4, P5 Panelboards and Switchboards
Wire Gauge
10-1/0 AWG
Max Wire
1/0 AWG
Min Wire
10 AWG
Protection and operation
Trip Technology
Thermal Magnetic
Trip Function Code
LI
Trip Function
Long-Time, Instantaneous
Trip Adjustability
Fixed Thermal, Fixed Magnetic
Standards and features
Standards
NEMA
Approval
CSA, IEC, UL
Temp Rating
40 °C
Product FAQs
6 answers
Which panelboards and switchboards are compatible with the Siemens ED43B040L?
The ED43B040L is designed for use in Siemens Sentron panelboards, SB switchboards, and Sentron Power Centers that accept ED-frame molded case circuit breakers.
What does a feed-thru connection mean for the ED43B040L?
A feed-thru connection indicates that the breaker is designed for cable-in and cable-out installations. It comes equipped with lugs on both the line and load sides, making it suitable for individual enclosures or specific panelboard configurations.
Can the ED43B040L be reverse fed?
Yes, Siemens ED-frame molded case circuit breakers can be reverse connected, allowing power to be supplied to either the line or load side terminals.
Does this breaker have an adjustable trip unit?
No, the ED43B040L features a non-interchangeable, fixed thermal-magnetic trip unit with long-time and instantaneous trip functions.
Can I install this Siemens ED-frame breaker in a panelboard from another manufacturer?
No. To maintain UL listing and ensure safe operation, Siemens circuit breakers should only be installed in Siemens or I-T-E panelboards specifically listed for their use.
Is the ED43B040L a direct replacement for older I-T-E ED4 breakers?
Yes, Siemens acquired I-T-E and continues to manufacture the Sentron ED-frame series. The ED43B040L can directly replace older I-T-E breakers with the exact same catalog number.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 20 reviews.
Siemens ED43B100 - 100A 3 Pole Molded Case Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
9/8/26
Siemens ED43B100 breeaker
Breaker arrived even earlier than expected. In great condition and very well packaged. Customer service was helpful and resolve all questions.
KL
Kristofer L.
Verified Buyer
Reviewing
Siemens ED43B015 - 15A 3 Pole Molded Case Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
9/1/26
Product delivered was perfect.
This was my first order with Super Breakers so you just don't know what you will get. My products came quickly and just as described. I was very pleased with my experience and will use them in the future.
SW
Scott W.
Verified Buyer
Reviewing
Siemens ED43S100A - 100A 3 Pole Molded Case Switch
I recommend this product
Rated 5 out of 5 stars
6/10/26
Great transaction
We received the breaker we needed in great shape and in a timely manner!
We will defiantly be ordering from Super breaker again.
KK
Kurt k.
Verified Buyer
Reviewing
Siemens ED43B080 - 80A 3 Pole Molded Case Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
5/18/26
Fast shipping
I needed the breaker quickly for a job. It arrived earlier than I expected which kept the job moving along.
MS
mark s.
Verified Buyer
Reviewing
Siemens ED41B020 - 20A 1 Pole Molded Case Circuit Breaker
I recommend this product
Rated 5 out of 5 stars
3/16/26
Exactly what I ordered
I ordered 12 Siemens breakers. My order was exactly what I ordered, They came fast, and everything was in good shape. I will be using superbreakers in the future.