Description
The Hyundai HMX 31R is a heavy-duty auxiliary control relay (contactor relay) manufactured by Hyundai Heavy Industries Co., Ltd. (Made in Korea). Engineered for high reliability in demanding marine switchboards, motor control centers (MCC), and industrial automation circuits, it features a 4-pole contact arrangement consisting of 3 Normally Open (NO) and 1 Normally Closed (NC) contacts.
This unit carries comprehensive marine type-approval endorsements from world-class classification societies including Lloyd’s Register (LR), Bureau Veritas (BV), ClassNK (NK), Korean Register (KR), and American Bureau of Shipping (ABS), making it a drop-in replacement for onboard auxiliary engine panels and power distribution systems.
Technical Specifications
| Specification Parameter | Value / Detail |
| Manufacturer | Hyundai Heavy Industries Co., Ltd. (South Korea) |
| Model / Type | HMX 31 |
| Device Type | Auxiliary Control Relay / Contactor Relay |
| Coil Voltage | 220V AC |
| Contact Configuration | 4 Poles: 3 NO + 1 NC (Terminals: 13-14 NO, 21-22 NC, 33-34 NO, 43-44 NO) |
| Continuous Thermal Current | 20A |
| Rated Insulation Voltage | 750V (IEC / EN) / 1000V (VDE 0660) |
| AC-15 Operational Current / Voltage | 220V @ 10A | 380V @ 4A | 440V @ 3.5A | 500V @ 3A | 690V @ 2A |
| NEMA Rating | A300 – P150 Heavy Pilot Duty / General Purpose |
| Compliance Standards | IEC 60947-4-1, IEC 60947-5-1, EN 60947-4-1, EN 60947-5-1, VDE 0660, UL Listed, CE |
| Marine Certifications | KR, LR, AB (ABS), BV, NK |
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