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Pull-reset Safety with 10A 250VAC High Load Limit Switch

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Pull-reset high load safety limit switchESL4NR with a industrial-grade direct disconnect structure, 10A 250VAC high current bearing, instantaneous rope pull can be reset. The Class II double insulation design, no grounding required, meets EN60947-5-1 standards, and provides reliable human-machine safety protection for critical equipment.
  • ESL4NR

  • Esinctrl

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What exactly does the "direct disconnect structure" about this ESL4NR limit switch mean? How does it keep it safe?

Pull-reset high load safety limit switchESL4NR with a industrial-grade direct disconnect structure, 10A 250VAC high current bearing, instantaneous rope pull can be reset. The Class II double insulation design, no grounding required, meets EN60947-5-1 standards, and provides reliable human-machine safety protection for critical equipment. Compact metal housing, IP65 protection, easy installation, suitable for harsh working conditions such as high dust and high vibration.

The direct disconnection structure is the most core feature of the ESL4NR series as a safety limit switch, which is directly related to the safety of equipment and personnel.

Its working principle and safety are reflected in the following aspects:

  1. Forced physical disconnection:

    In ordinary limit switches, if the contacts are melted (stuck together) due to high current or short circuit, the circuit cannot be disconnected even if the drive mechanism is reset, causing the machine to continue to operate even if it is considered safe, which is extremely dangerous. The ESL4NR's direct disconnect structure is designed with a forced tripping device that is physically linked to the contact mechanism.

  2. Safety guarantee under fault:

    When contact welding occurs, the machine presses the actuator (such as plunger or lever) again, and the force generated by this action will directly act on the linkage mechanism, forcibly pried open the NC (normally closed) contacts that have been melted and welded, thereby physically disconnecting the circuit and sending a stop signal to the control system.

  3. Compliance with international safety standards:

    This mechanism strictly complies with the EN 60947-5-1 standard for "direct disconnect operation". This means that its safety performance has been validated to international standards and is ideal for use in safety loops such as safety doors, shield interlocks.


      In short: even if the internal switch is "stuck" due to a malfunction, its mechanical design ensures that it is forced to be disconnected from the outside, thus guaranteeing that a safety signal is always issued. This is what sets it apart from ordinary limit switches.
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