The 1SDA038439R1: The 400 A continuous rating means this breaker handles a 400 A load at 40 °C without derating — sized for a main feeder or a large motor branch circuit. The short-circuit release range of 2000-4000 A (I²t on/off) sets the magnetic trip point; at 2000 A it trips instantaneously, at 4000 A it's guaranteed to trip. This is a standard MCCB for 480 VAC or 600 VAC distribution panels, not a motor-circuit protector (no adjustable overloads).
ABB S5N400 1SDA038439R1 Molded Case Circuit Breaker, 400 A
MPN1SDA038439R1
ABB S5N400 molded case circuit breaker, 1SDA038439R1, 400 A rated, 3-pole, fixed thermal-magnetic trip, line/load terminals.
$1,219.20Ref. price · indicative, final on quote
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Weight | 1.36 kgs |
Product details
Frequently asked questions
What is the closest alternative to 1SDA038439R1 in the ABB S5 family?
Within the S5N frame, the key variant is the trip unit rating. This 1SDA038439R1 is the 400 A fixed thermal-magnetic version. A 320 A or 630 A version would be a different order code with the same frame size but different trip rating — not pin-compatible for the same load.
Where can I buy 1SDA038439R1 and get current pricing?
This part is sourced to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm availability and current pricing — stock levels and lead time vary by batch.
MPN
1SDA038439R1