Schneider RE7RM11BU Miniature Circuit Breaker

Description

Schneider RE7RM11BU Miniature Circuit Breaker

The Schneider Electric MZ18B is a specialized auxiliary contact block used primarily within the Multi9 or Acti9 modular ranges (specifically older or specialized series like the C60). It serves as a status signaling device, allowing the electrical system to communicate the position of the circuit breaker to a controller or monitoring system.

Product Detailed Description

The MZ18B is an OF (Open/Fault) auxiliary contact. Its primary function is to indicate the ON/OFF status of the associated circuit breaker. It is a modular unit that clips onto the left-hand side of a compatible Schneider Miniature Circuit Breaker (MCB) or Residual Current Circuit Breaker (RCCB). When the breaker toggles, the internal mechanical linkage of the MZ18B moves a set of changeover contacts.

Product Advantages

• Space Saving: At only 9 mm wide, it adds minimal bulk to the electrical distribution board.
• Simple Installation: Designed for tool-free assembly; it snaps directly onto the side of the circuit breaker.
• Reliable Signaling: Provides a clean, dry contact signal that is easily read by PLCs, building management systems (BMS), or indicator lights.
• Versatile Voltage: Rated for both AC and DC control circuits, providing flexibility for different automation standards.

Important Considerations & Precautions

• Left-Side Mounting: This module is strictly designed for left-side mounting. Ensure there is enough physical clearance in the enclosure on the left side of your MCB.
• Compatibility: Verify that your specific circuit breaker model supports auxiliary attachments. It is most commonly used with the Multi9 C60 series.
• Wiring Limits: Do not exceed the rated current of the auxiliary contacts (e.g., 6A at 240V). If you need to switch a heavy load, use the MZ18B to trigger an intermediate relay.
• Tightening Torque: Use the correct torque (typically around 0.8 N.m) for the terminal screws to ensure a secure electrical connection without stripping the plastic.

Product Applications

• Remote Monitoring: Sending a signal to a central control room or SCADA system to confirm if a circuit is energized.
• Automation Logic: Providing “Run/Stop” feedback to a PLC for motor control or sequence-of-event logging.
• Indicator Lights: Powering a green or red pilot light on a cabinet door to show the breaker’s status.
• Interlocking: Creating electrical interlocks between different breakers to prevent unsafe operating conditions.

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