The ABB S201-K15 is a 1-pole supplemental protector from the S200 series, rated 15 A with Trip Curve K, 277 VAC, and a 6 kA interrupting capacity. Listed to UL 1077, it serves as a branch-circuit-rated supplementary overcurrent device for control panels, HVAC equipment, and industrial machinery where the upstream feeder already provides main fault protection. The K curve offers a magnetic trip between 10× and 14× In, making it suited for loads with moderate inrush — think solenoid banks, contactor coils, or small power supplies that would nuisance-trip a C-curve but don't need the high hold of a D-curve.
What the ratings mean for fit
The 15 A continuous rating at 277 VAC single-phase covers a 4.2 kVA resistive load at full line voltage. The 6 kA interrupting rating at 277 VAC is the maximum fault current the protector can safely clear — adequate for most control-panel secondary circuits fed from a 10 kVA or smaller transformer, but verify against your panel's available fault current (SCCR) on the nameplate. The K curve's 10–14× magnetic trip band means it holds through the inrush of a 15 A-rated contactor coil bank or a 150 VA control transformer; if your load is a motor starter with a 20× locked-rotor inrush, step up to a Z-curve or a dedicated motor-circuit protector.
Panel integration notes
Mounts on standard 35 mm DIN rail per EN 60715. The 1-pole module occupies 17.5 mm of rail width — one TE (terminal width). Spring-cage terminals accept 0.5–25 mm² solid or stranded copper, with a strip length of 9–10 mm. The busbar comb can bridge adjacent S200 poles for common feed; verify the comb's current rating matches the 15 A load. In a multi-pole assembly, the S201-K15 snaps into the same rail profile as the S200 series, so a panel originally laid out for S201M-C10 accepts this K-curve variant with zero mechanical rework — just swap the module and confirm the trip curve matches the load.
Compliance documentation
Listed to UL 1077 (Supplemental Protectors) and CSA 22.2. The S200 series carries CE marking and is RoHS-compliant per EU Directive 2011/65/EU. REACH compliance documentation (SVHC declaration) is available from the manufacturer's technical support portal. No IEC 60898 or 60947-2 rating applies — this is a UL 1077 supplemental protector, not a full branch-circuit MCB; the distinction matters for panel SCCR calculations where the UL 508A supplement allows supplemental protectors only for specific component protection roles.