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Relay Protection Device 4n

A 4N relay protection device is a relay module with four contacts, designed for controlling electrical circuits, providing safety functions, or integrating with automation systems.Overview

A 4N relay typically refers to a device with four contacts, which can be normally open (N/O) or normally closed (N/C), used to control or protect electrical equipment. These relays are widely used in industrial automation, plant control, and safety circuits to operate contactors, valves, signal lights, or other devices reliably .

Types and Features
  1. WWC-4N Relay Box
    • Contains four potential-free changeover contacts.
    • Operates with 230V AC supply and 12V DC control voltage.
    • Equipped with status LEDs for monitoring operating conditions.
    • Housed in a robust IP66/IP68-rated enclosure, protecting against dust and water.
    • Compatible with evaluation units like WWA-1, 82b-2, 82c-2, 83sigma, 84vario .
  2. Safety Relay Expansions (e.g., PNOZsigma)
    • Provides 4 N/O and 1 N/C contacts for expanding safety relay outputs.
    • Operates at 24V DC with plug-in screw or spring-loaded terminals.
    • Used in emergency stop, safety door, and light curtain monitoring.
    • Can be cascaded to increase the number of contacts for complex safety circuits .
  3. Protective Relays
    • Designed to detect abnormal conditions such as overcurrent, overvoltage, or faults in power systems.
    • Can be electromechanical or digital (microprocessor-based).
    • Digital relays can combine multiple protection functions, provide self-testing, and interface with SCADA systems.
    • Operate by tripping circuit breakers or initiating alarms to protect equipment and ensure safety .
Applications
  • Industrial Automation: Controlling motors, valves, and signal devices.
  • Safety Systems: Emergency stops, light curtains, and safety doors.
  • Power System Protection: Detecting faults and abnormal conditions in electrical networks.
  • Integration with Control Units: Works with evaluation modules for complex automation and monitoring setups.
Key Considerations
  • Contact Type: Ensure the relay has the required N/O or N/C configuration.
  • Voltage Ratings: Match the relay's supply and control voltage to your system.
  • Safety Standards: For safety relays, check compliance with EN ISO 13849 or equivalent.
  • Environmental Protection: IP ratings indicate suitability for dust and water exposure.
  • Expandability: Some modules allow cascading to increase the number of contacts. A 4N relay protection device is versatile, combining control, safety, and protection functions in a compact module suitable for industrial and electrical applications.
Relay Protection Device 4n

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SEB IBF 4N digital overcurrent protection relay User manual

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ANSI device numbers

In electric power systems and industrial automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments. The device numbers are enumerated in ANSI/IEEE Standard C37.2 Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations. Many of these devices protect electrical systems and individual system components from damage whe

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MY4N Datasheet (HTML) - Omron Electronics LLC MY4N Product details Versatile and Function-filled Miniature Power Relay for

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It has a built-in LED to alert users to the operating status. This general purpose relay has plug-in terminals for connecting to a socket

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If you own this product and need technical support, visit our support page to

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In and, ANSI Device Numbers can be used to identify equipment and devices in a system such as,, or . The device numbers are enumerated in / Standard C37.2 Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations.
Many of these devices protect electrical systems and individual system components from damage whe

In and, ANSI Device Numbers can be used to identify equipment and devices in a system such as,, or . The device numbers are enumerated in / Standard C37.2 Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations.
Many of these devices protect electrical systems and individual system components from damage whe

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