FTM50/FTM51 Relay (FEM54) Overview
FTM50/FTM51 relay combined with FEM54 socket is one of the most widely used relay combinations in China's industrial control field. This series of relays is known for high reliability, long life, and flexible contact configurations, suitable for PLC output, signal isolation, motor control, and other scenarios.
This article systematically introduces connection methods, functional features, technical parameters, etc., to help engineering technicians and procurement personnel quickly master its usage points.
FTM50/FTM51 Relay Functional Features
Core Functions
- Signal isolation and amplification: Converts weak control signals into high-power output, protecting host equipment.
- Multi-channel contact output: Supports normally open (NO) and normally closed (NC) contacts, meeting different logic control requirements.
- Fast response: Short action time, suitable for high-frequency switching occasions.
- LED status indication: Some models have indicator lights for on-site debugging and troubleshooting.
Typical Applications
- PLC digital output modules
- Industrial automation control cabinets
- Power system protection and signal transfer
- Mechanical equipment electrical control
FEM54 Socket Connection Method
Terminal Definitions
The FEM54 socket typically uses an 8-pin or 11-pin circular arrangement, with terminal functions as follows:
| Terminal Number | Function | Description |
|---|---|---|
| 1, 2 | Coil | Connect control voltage |
| 3, 4, 5 | Common/NO/NC | First set of contacts |
| 6, 7, 8 | Common/NO/NC | Second set of contacts |
Connection Steps
- Confirm the relay model matches the socket and check the rated voltage.
- Fix the FEM54 socket on the guide rail or panel.
- Connect the coil control wires according to terminal definitions, paying attention to polarity (DC type).
- Connect load wires to the corresponding contact terminals, ensuring load current does not exceed contact capacity.
- Insert the relay and power on to test if the action is normal.
Technical Parameters and Selection Reference
| Parameter | FTM50 | FTM51 |
|---|---|---|
| Contact Form | 2CO (Double Pole Double Throw) | 2CO (Double Pole Double Throw) |
| Rated Current | 5A/10A | 5A/10A |
| Coil Voltage | DC12V/24V, AC110V/220V | DC12V/24V, AC110V/220V |
| Mounting Method | FEM54 Socket | FEM54 Socket |
Selection Tip: Choose appropriate contact capacity based on load type (resistive/inductive) and current size. Inductive loads are recommended to be derated.
Common Problems and Precautions
- Always disconnect power before wiring to prevent electric shock or equipment damage.
- Coil voltage must match the nominal value to avoid burnout.
- Regularly check contact wear and replace relays in time.
- In vibrating environments, ensure the socket buckle is tight.
Correct connection and use of FTM50/FTM51 relay (FEM54) can significantly improve control system stability and reduce failure rates.