| Attribute | Value |
|---|---|
| Brand | ELECTROMATIC |
| Model | S-SYSTEM SM 170 440 |
| Supply | 3X440 VAC |
| Type | 3 Phase Sequence Voltage Relay |
| Product Code | 557420 |
| Additional Code | S411 |
| Contact Rating | 10A/400V~ 10A/300V~ |
| Weight | 300 GM |
| Condition | Used (1 PCS) |
| Reference No. | 54286 |
What is a Phase Sequence Voltage Relay?
A phase sequence voltage relay is a type of protection equipment that checks the order, absence, and levels of the phases in a 3-phase power system. It guarantees that motors and other vital equipment operate safely without being harmed by improper phase sequencing, lost phases, or voltage imbalance.
Incorrect phase sequence may result in motors running in the wrong direction or failing to run altogether. Phase failure can result in overheating, lower efficiency, and possible equipment breakdown. That’s where the Electromatic SM 170 440 comes in.
Features of the Electromatic S-System SM 170 440
3-Phase Monitoring with Accuracy:
SM 170 440 is specifically intended to monitor the right phase sequence of a 3-phase network (typically at 440V). It detects immediately whether any phase is missing, reversed, or indicates voltage imbalances.
Voltage Range & Sensitivity:
It accommodates a broad voltage range, typically used for 440V systems, and can identify even minimal variations from standard parameters, ensuring sensitive equipment is not damaged.
Built-In Delay Feature:
This relay normally includes a time-delay mechanism to prevent false tripping during short-lived voltage fluctuations. This ensures stability and avoids unnecessary system interruptions.
Compact Design with Base:
The SM 170 440 has a mounting base that facilitates easier installation and stability, particularly in tightly mounted panels or rugged industrial settings.
Indicator LEDs:
Visual indicators provide easy diagnosis. They inform you about the relay status, which enables easier monitoring and troubleshooting.
Long-Term Reliability:
With its high-quality parts, the relay provides years of maintenance-free operation even in harsh environments.
Why Is Phase Sequence Monitoring Important?
Faulty phase sequence or loss of phase can be disastrous for 3-phase motors. It can:
- Reverse motor rotation, resulting in mechanical damage.
- Increase motor temperature and reduce lifespan.
- Cause unplanned shutdowns or expensive downtime.
- Present safety risks to personnel and equipment.
The SM 170 440 eradicates these risks by continuously monitoring and isolating the problem before it damages the system.
Applications of the Electromatic SM 170 440
The relay has applications in a variety of industries including:
Manufacturing facilities – where 3-phase power drives the machinery and downtime is expensive.
HVAC systems – where motors and compressors need to rotate in the right direction.
Pumps and fans – where improper phase can result in backflow or mechanical destruction.
Conveyors and elevators – where direction and stability are critical to safety.
It’s a favored option in both automatic control panels and heavy-duty motor control centers.
