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    Pressure relief devices for transformers and on-load tap-changers

    Your benefits at
    a glance

    • Hood with inlaid micro-switches
    • Defined valve stroke of approx. 4mm up to forced activation of the main switching contacts
    • Weather-resistant aluminum signal pin with two notches prevents roll-back of an incompletely extended pin
    • Steel springs in accordance with EN 10270-1-SH, plastic-coated, customer-specific part painting (KTL)
    • Opens within 2ms; closes within 70ms
    • Seawater-resistant cover
    • Suitable for wind power plants

    Product description

    The standard protective cover protects the internal micro switches and the springs against outside influences. In addition, it ensures that the oil flows out in a defined way during operation. The cover is made of sea-water-resistant aluminum. When the operating pressure is reached, the plate lifts up to create an opening through which gas or oil can escape. The aluminum signal pin raises and operates the micro switches. The defined stroke allows the contacts to react within 2 ms. The pin adjusts its position while the pressure relief device closes securely.

    MESSKO® MPREC® pressure relief devices are available in a range from 4 to 30 psi (0.28 to 2.07 bar). Electrical connection can be implemented with cable glands or a terminal box. ANSI and Westinghouse connectors are also available for the North American market.

    The MESSKO® MPREC® pressure relief devices are also available with an oil-directed cover.