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JRCS JSTD-M15A
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Yaskawa JGSM-06
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Honeywell FC-SDO-0824
Honeywell FC-SDO-0824

JRCS JSTD-M15A

Product Name:​ Marine / Shipboard Thermal-Magnetic Circuit Breaker — JSTD Series (JSTD-M15A)
Product Introduction:​ Compact miniature circuit breaker (MCB/MCCB class) manufactured by Japan Radio Co., Ltd. (JRCS) for marine and offshore power distribution systems; designed to IEC/ISOmarine standards for protecting 15 A rated branch circuits in shipboard AC/DC low-voltage panels.
Category:
Description
Technical Specifications:
  • Model:​ JSTD-M15A
  • Rated Current (In):​ 15 A
  • Poles:​ Typically 1-pole or 2-pole (verify by panel drawing; JSTD series commonly single-pole for DC 125 V or 2-pole for AC 250 V marine boards)
  • Rated Voltage (Ui):​ AC 250 V / DC 125 V (typical for JRCS JSTD marine breakers)
  • Breaking Capacity (Icu):​ Generally 3 kA–5 kA @ 250 VAC (marine grade)
  • Trip Characteristic:​ Thermal-magnetic; thermal inverse-time overload, magnetic instantaneous short-circuit
  • Mounting:​ DIN rail or dedicated JRCS marine switchboard clip-in mounting
  • Compliance:​ IEC 60947-2; meets Class Society requirements (NK, LR, DNV, ABS per certification)
  • Operating Temp:​ -25 °C to +60 °C
  • Humidity:​ Up to 95 % RH (non-condensing)
  • Dimensions:​ Approx. 18 mm width per pole × standard height for JSTD series
    Material & Structure:​ Flame-retardant thermoplastic housing (UL94-V0), silver alloy contacts, bimetal strip for overload, electromagnetic coil for short-circuit.
    Installation Notes:​ Tighten terminal screws to specified torque; ensure correct polarity for DC application; derate current capacity if installed in enclosures with elevated ambient temperature or multiple adjacent loaded breakers (> 60 % grouped loading).
    Applications:​ Low-voltage distribution boards on merchant vessels, offshore platforms, naval ships — protects lighting circuits, control panel feeders, auxiliary machinery small loads.
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