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ABB S803U-K70 — Miniature Circuit Breakers (MCB)

S803U-K70 ABB Miniature Circuit Breaker, 70A 3P K-Curve, 50k

MPNS803U-K70

ABB S803U-K70, Miniature Circuit Breaker, Molded Case, 70A, 3-Pole, 240VAC, K Trip Curve, 50 kAIC, DIN Rail Mount.

$432.24Ref. price · indicative, final on quote
ABB S803U-K70 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S803U-K70 — Specifications
ParameterValue
Weight0.91 kgs

Product details

70A K-Curve MCB for Panel Protection

The ABB S803U-K70 is a 70-amp, 3-pole miniature circuit breaker with a K trip curve, rated for 240 VAC and a 50 kA interrupting capacity. The K-curve trips between 10x and 14x rated current, making it suited for motor and transformer branch circuits where inrush current is higher than a standard C-curve would tolerate without nuisance tripping.

The K-curve's 10–14x magnetic trip band handles the inrush of motor starters and power supplies that would push a B- or C-curve breaker into nuisance trips, yet still clears a hard short fast enough to protect downstream wiring.

Frequently asked questions

Where can I buy S803U-K70 and how is it quoted?

The S803U-K70 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quotation.

What is the interrupting rating of S803U-K70?

The S803U-K70 has a 50 kA interrupting capacity at 240 VAC, meaning it can safely clear fault currents up to 50,000 amps.

What does the K-curve mean on this breaker?

The K-curve trips magnetically between 10x and 14x rated current (700–980 A for this 70 A unit), making it suitable for motor and transformer branch circuits with high inrush.

MPN
S803U-K70