MCB Alarm and Auxiliary Contact

CDADA is a manufacturer and supplier with 40+ years of experience, we’ve seen too many projects where panel operators miss a tripped breaker—until it’s too late. That’s why we designed the CDADA MCB Alarm and Auxiliary Contact (DAB7-FL): a smart, space-saving solution that gives you two critical signals in one module—breaker position (ON/OFF) and trip reason (overload/short-circuit).

Our Advice: If your control system needs to distinguish between a manual off and a fault trip, this is the accessory you must specify. Standard auxiliary contacts alone can’t tell the difference—but ours can.

Dual-Function Design: One Module, Two Signals

The CDADA MCB Alarm & Auxiliary Contact features two independent transfer contacts with a clever mechanical selector:

★ Yellow indicator at “A”: Both contacts act as auxiliary contacts → signal MCB ON/OFF state

★ Yellow indicator at “AL”:

★ Left contact = Auxiliary (ON/OFF status)

★ Right contact = Alarm (activates only when MCB trips due to fault)

★ This means you can wire:

★ A green light to show “power on”

★ A red light or PLC input to trigger “fault alarm”

★ All from a single add-on module on your DAB7-63 MCB.

Technical Specifications

Important: This accessory cannot be used standalone—it must be mounted directly onto a DAB7-63 MCB.

Installation Guide (From Our Field Engineers)

★ Follow these steps for safe, reliable operation:

★ Power OFF the circuit before installation.

★ Slide the DAB7-FL module onto the left side of the DAB7-63 MCB until it clicks.

★ Secure with the included double-sided tape (for vibration resistance).

★ Connect wires to the 4 terminals (2 per contact group):

★ Use left pair for auxiliary (status)

★ Use right pair for alarm (trip detection)

★ Set the yellow selector to “AL” if you need fault alarm functionality.

★ Test: Manually trip the MCB—only the alarm contact should change state during a fault trip.

★ Pro Tip: Label your wires clearly! Many technicians confuse auxiliary vs. alarm signals during commissioning.

When Should You Use This Instead of a Standard Auxiliary Contact?

Typical Applications:

★ Data center PDU monitoring

★ Solar combiner boxes

★ Industrial control panels

★ Building management systems (BMS)

★ Elevator or HVAC safety circuits

Frequently Asked Questions

Q1: Can I use this on non-CDADA MCBs?

A1: No. The DAB7-FL is mechanically and dimensionally designed only for CDADA DAB7-63 breakers. It will not fit Schneider, ABB, or Siemens MCBs.

Q2: How does the alarm contact actually work?

A2: Inside the MCB, a trip latch mechanism moves differently during a thermal/magnetic fault trip vs. a manual switch-off. The DAB7-FL detects this mechanical difference and activates the alarm contact only during real faults.

Q3: Do I need both contacts wired?

A3: Not necessarily. You can use just the auxiliary, just the alarm, or both—depending on your control logic. The module gives you flexibility.

Q4: Is it suitable for DC solar applications?

A4: Yes! With a DC-12 rating of 110V/0.5A, it’s ideal for solar string monitoring where you need to detect PV array faults remotely.

Q5: Why choose CDADA over generic brands?

A5: Because we offer:

● True fault discrimination (not just position sensing)

● Seamless integration with DAB7 MCBs—no adapter plates

● Factory-tested mechanical coupling – no play or missed signals

● Clear visual indicator (yellow flag) for field verification

● Global certifications (CE, CB, RoHS) for hassle-free projects

Final Note from CDADA R&D

In modern electrical systems, ‘on/off’ isn’t enough—you need intelligence. Our MCB Alarm & Auxiliary Contact turns a simple breaker into a diagnostic node, helping you build smarter, safer panels. And because it’s made by the same team that designs the MCB, you get perfect synergy—no guesswork.” — CDADA Product Development Team

Ready to order? We offer:

● Bulk discounts for panel builders

● Pre-assembled MCB + DAB7-FL units (save labor)

● Free wiring diagrams & PLC logic examples