| Attribute | Value |
|---|---|
| Brand | ELECTROMATIC |
| Model | SM 170 440 |
| Voltage | 260/440V~ 50/60HZ |
| Description | 3 PHASE SEQUENCE VOLTAGE RELAY |
| Reference | E92191 |
| Current Rating | 10A/380V~ 10A/300V~ |
| Origin | MADE IN SPAIN |
| Weight | 290 GM |
| Condition | USED 1 PCS |
| Ref No | 54285 |
What is a Phase Sequence Voltage Relay?
Before diving into the specific features of the Electromatic SM 170 440, let’s quickly understand the function of a phase sequence voltage relay.
Three-phase systems need to have a particular phase sequence—L1, L2, and L3. Reversal of this sequence or failure of a phase can make motors operate in the opposite direction or not at all, even causing damage. A phase sequence voltage relay detects these faults and breaks the circuit before any damage is caused.
Introducing the Electromatic SM 170 440
Electromatic SM 170 440 is a small, DIN-rail-mountable relay that provides precise monitoring of 3-phase power systems. It’s designed to support voltages up to 440V AC and features a robust base for convenient mounting.
Key Features:
Phase sequence monitoring: Identifies wrong phase sequence or rotation.
Phase failure protection: Detects missing phases or unbalanced voltages.
Voltage range: Works optimally between 170V and 440V.
Compact design: Occupies less space in control panels.
Simple installation: Includes mounting base and standard terminals.
LED indicators: Give instant indication of system health.
Fast response time: Rapidly disconnects loads to avoid equipment damage.
How It Works
The SM 170 440 detects the incoming three-phase voltage. If the voltage is within the proper range and all three phases are in the correct sequence, the relay closes, enabling power to reach connected equipment.
But if a phase is absent, undervoltage is sensed, or the sequence of phases is wrong, the relay turns off. This shut-off safeguards motors and attached equipment from possible harm.
Applications
This voltage relay is extensively used in industries dependent on three-phase motors and machinery. Some common applications are:
Industrial Automation Systems
Guarantees correct operation of motor-driven conveyors, compressors, and pumps.
HVAC Equipment
Protects air conditioners and big fans against running reverse or under unbalanced voltages.
Elevator and Lift Installations
Protects elevators against running under unsafe electrical conditions.
Pumping Stations
Protects water or chemical pumps from running when voltage conditions are unsuitable.
Textile and Manufacturing Factories
Preserves the health of sensitive machinery by disconnecting power when faults occur.
Advantages of Using the SM 170 440
Prevents expensive equipment damage
Early voltage fault detection reduces maintenance expenses and prolongs machine life.
Improves workplace safety
Automatic shutdown prevents fire risks or accidents due to electrical faults.
Increases operational efficiency
Eliminates unplanned downtimes and maintains production lines in operation.
Consistent performance
Reliable for long-term operation in harsh industrial conditions.
