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ABB S803S-K80 — 3-Pole MCB (DIN Rail)

S803S-K80 80A 3-Pole K-Curve MCB, 50 kA

MPNS803S-K80

ABB S803S-K80, miniature circuit breaker, 80 A, 3-pole, Trip Curve K, DIN rail mount, 50 kA interrupting rating AC.

$152.40Ref. price · indicative, final on quote
ABB S803S-K80 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

S803S-K80 — Identification
ParameterValue
Number of poles3
S803S-K80 — Electrical
ParameterValue
Voltage (AC)230
Current (A)80
S803S-K80 — Protection
ParameterValue
Interrupting rating (AC)50 kA
S803S-K80 — Mechanical
ParameterValue
Mounting typeDIN Rail
S803S-K80 — Other specifications
ParameterValue
TypeTrip Curve K

Product details

Trip Curve K means the magnetic trip operates between 8 and 12 times rated current, which is narrower than Curve C (5–10×) but wider than Curve D (10–20×). For an 80 A breaker, that puts instantaneous magnetic trip between 640 A and 960 A — a good match for inductive loads like transformers or solenoid banks where inrush can briefly hit 8–10× but shouldn't nuisance-trip on a C-curve. The 50 kA interrupting rating at 400/690 VAC tells you this breaker can safely clear a fault up to 50,000 A without welding contacts or rupturing the case — essential for high-fault-capacity panels near large transformers. Three poles let it switch all three phases simultaneously, which matters for any 3-phase load that must not single-phase on a fault.

The 3-pole width is 3 module spaces (about 54 mm on most DIN-rail enclosures). For a panel fill calculation, count 3 TE (terminal units) per breaker.

Frequently asked questions

What is the S803S-K80's interrupting rating?

The S803S-K80 carries a 50 kA interrupting rating at 400/690 VAC, meaning it can safely clear a fault current up to 50,000 A without failing. That's a high-capacity rating suitable for panels fed by large transformers or high-fault utility services.

What does Trip Curve K mean on this breaker?

Trip Curve K means the magnetic (short-circuit) trip operates between 8 and 12 times rated current. For this 80 A breaker, instantaneous trip occurs between 640 A and 960 A. That's tighter than a D-curve (10–20×) but looser than a C-curve (5–10×), making it a good fit for inductive loads like transformers, solenoid banks, or motor starters where inrush can reach 8–10× but shouldn't nuisance-trip a C-curve.

Where can I buy the S803S-K80?

The S803S-K80 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm date and quantity.

Will S803S-K80 drop into a panel specified for S203-D13?

The S803S-K80 shares the same DIN-rail footprint and 3-pole form factor as the S203-D13, so it fits the same panel space and busbar arrangement without rewiring. However, the trip curves differ: S803S-K80 is Curve K (8–12× In), while S203-D13 is Curve D (10–20× In). Verify the load's inrush profile — if the original spec called for D-curve to handle high transformer inrush, a K-curve may trip earlier. For motor or resistive loads, the K-curve is often a direct functional equivalent.

MPN
S803S-K80