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ZYHM1E Electronic Molded Case Circuit Breaker

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  • Detail

    Scope of Application
    1. Selective Coordination: The ZYHM1E electronic molded case circuit breaker features three-step protection functionality. Breakers with category B classification achieve selective coordination with other short-circuit protection devices connected in the same circuit under short-circuit conditions.

    2. Adjustable Protection Parameters: Users can configure tripping thresholds and time delays for overcurrent protection based on load requirements.

    3. Self-Powered Design: The electronic trip unit derives energy from the breaker itself, with current signals and operating power supplied by integrated current transformers.

    4. Pre-Alarm Indication: When the actual operating current reaches or exceeds the pre-alarm threshold (IRO), the yellow "PRE-ALARM" LED on the breaker cover illuminates.

    5. Overload Indication: The red LED on the breaker cover activates when the load current exceeds the long-delay overcurrent tripping threshold.

    6. High-Current Instantaneous Tripping: Upon encountering short-circuit currents exceeding 20In during closure or operation, the electromagnetic trip mechanism directly triggers breaker disconnection.

    7. Interchangeable Installation: The physical dimensions match those of the ZYHM1 series molded case circuit breakers, ensuring compatibility and interchangeability.

    Circuit Breaker Classification

    1. Pole Configuration
    Classified into three-pole and four-pole variants. For four-pole models, the neutral pole (N-pole) features:

    N-pole overcurrent protection current and time parameters automatically track 100% of the phase line setting values.

    N-pole switches synchronously with the other three poles (N-pole closes first and opens last).

    2. Rated Current Ratings

    ZYHM1E-125: 32A, 63A, 125A

    ZYHM1E-250: 250A

    ZYHM1E-400: 400A

    ZYHM1E-630: 630A

    ZYHM1E-800: 800A

    3. Connection Methods

    Available in five configurations:

    Front-panel wiring

    Rear-panel wiring

    Plug-in front-panel wiring

    Plug-in rear-panel wiring

    Draw-out wiring

    4. Accessory Configuration

    Offered with or without accessories. Accessories are divided into internal and external categories:

    Internal Accessories: Shunt trip devices, undervoltage trip devices, auxiliary contacts, and alarm contacts.

    External Accessories: Rotary handle operating mechanism and motorized operating mechanism.
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