ABB PN8NCH2J 1MYN563612-DAC Relay

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• • • • 1. Product Model & Basic Introduction

        Model: PN8NCH2J (Order No. 1MYN563612-DAC)
        This relay belongs to ABB’s P8n/PN8n auxiliary relay family. The PN8n variant is designed for high-drop-off voltage capability and includes an operation indicator. It is an instantaneous electromagnetic auxiliary relay used for galvanic separation, contact multiplication and signal distribution in control and protection circuits. ABB Group+1

        2. Technical Specifications

        Below are the typical specifications for the PN8n series which apply to the PN8NCH2J model (confirm selected variant for exact values).

        • Series: PN8n auxiliary relays. ABB Library

        • Contact configuration: 7 freely configurable contacts with double interruption. Scribd

        • Coil rated voltages (auxiliary voltage): DC 24 V, 30 V, 48 V, 110 V, 125 V, 220 V, 250 V; AC 24 V, 30 V, 48 V, 110 V, 240 V for certain versions. ABB Library

        • Operating range (pickup/drop-off):

          • Pick-up voltage: < 80% of rated voltage. ABB Library

          • Drop-off voltage: > 20% of rated voltage (PN8n typ.). ABB Group+1

        • Operate time (typical): approx. 20 – 30 ms. ABB Library

        • Contact ratings: Up to 250 V DC/AC; typical current 5 A; making and breaking capacities depend on load and contact arrangement. ABB Library

        • Mechanical life: approx. 5 × 10⁶ operations. ABB Library

        • Insulation and environment:

          • Dielectric test 2 kV, 50 Hz, 1 min (IEC 60255-5) ABB Library

          • Vibration, shock, humidity tests per IEC 60255-21-1 and IEC 60068-2 series. ABB Library

        • Mounting style: “1/2 S” size flush-mounting case (for PN8nCH2J) ABB Group

        • Approximate weight: ~0.95 kg (1/2 “S” size) ABB Library

        3. Advantages and Features

        • Exceptional reliability: Designed for mission-critical protection and signalling circuits, with proven performance even after long periods of inactivity. ABB Library

        • Low drop-off voltage capability: Maintains operation until about 20% of rated coil voltage, improving resilience under degraded power conditions. ABB Group

        • Double interruption contacts: Enhances contact performance and lifespan through improved arc suppression and contact separation. ABB Library

        • Flexible voltage & contact configuration options: Allows selection of appropriate coil voltage, contact NC/NO ratio and mounting base to suit the application. ABB Library

        • Visual operation indicator: The CH2J version includes a drop-off indicator (flag) that pops out on release, facilitating maintenance checks. ABB Group

        • Space-saving installation form-factor: 1/2 “S” flush-mount version suits compact control panels and retrofit scenarios.

        • Industrial-grade design and standards compliance: Built to meet IEC requirements for mechanical endurance, environmental tolerance and electrical insulation. ABB Library

        4. Typical Application Areas

        • Power-system substations and generation plants: auxiliary control cabinets for trip signals, status monitoring and signal distribution.

        • Industrial automation control systems: used for signal isolation, amplification, distribution and feedback in control cabinets.

        • Switchgear auxiliary circuits: monitoring switch/CB positions, interlocking systems, feedback loops.

        • Transportation and heavy-duty industries (rail, mining, steel, etc.) where auxiliary relays must operate reliably under harsh conditions.

        • Maintenance or upgrade projects replacing older auxiliary relays with modern, reliable PN8n devices.

        5. Usage Notes & Precautions

         

        • Confirm that the selected coil voltage variant matches the control supply and that the contact configuration (NO/NC), mounting base (plug-in vs. flush) are compatible with the existing system.

        • Install in a location with minimal vibration, shock and corrosive environment; avoid extreme temperatures and ensure proper ventilation for best reliability.

        • Ensure wiring is correct, terminals are secure, conductor sizing is adequate, and auxiliary relays are used for control/ signalling loads only — not for switching high-power loads.

        • Periodically check function: ensure the mechanical indicator (if present) operates correctly, contacts open/close reliably, coil voltage remains stable.

        • For relays in standby or seldom-used circuits, perform periodic exercise to avoid contact stickiness or oxidation.

        • When used in protection circuits, ensure relay operate-time and mechanical life meet the overall protection scheme requirements.

        • When replacing older relays, check physical dimensions, mounting type and contact layouts to ensure plug-in compatibility and control logic integrity.