50/60 Hz Single Phase Voltage Monitoring Relay DIN Rail Mounting
For Compressors
When the line voltage is reduced to the critical voltage, the
action of the protection device is called undervoltage protection.
Its task is mainly to prevent the device from being burned due to
overload.
Due to short-circuit faults and other reasons, the line voltage
will greatly reduce or even disappear within a short time. It will
cause damage to lines and electrical equipment. For example, if the
motor is worn down or blocked, an overcurrent of several times the
rated current will be generated and the motor will be burned out.
When the voltage recovers, the self-start of a large number of
motors will cause the voltage of the motor to drop drastically and
cause damage.
The voltage that causes the motor to wear out is called the
critical voltage. When the line voltage is reduced to the critical
voltage, the action of protecting the electrical equipment is
called undervoltage protection. Its task is mainly to prevent the
equipment from being burned due to overload. When the voltage of
the circuit is lower than the threshold voltage, the protective
device is called the loss of voltage protection. Its main task is
to prevent the motor from starting.
Overvoltage protection is a type of protection that disconnects or
reduces the voltage of a controlled device when the protected line
voltage exceeds a predetermined maximum value.
Overvoltage protection, is a type of protection that disconnects
the power supply or reduces the voltage of the controlled device
when the voltage exceeds a predetermined maximum value. There are
many overvoltage protectors that come into being, some of which are
housed inside the equipment and some are installed on the power
supply side. With the protection of overvoltage protectors, we are
more secure when using electrical equipment.
The under voltage protector is a multi-function three-phase
three-wire power system or three-phase power equipment monitoring
and protection equipment. Sets three-phase voltage display,
over-voltage protection, under-voltage protection, phase loss
protection (phase protection), three-phase voltage imbalance
protection, phase sequence protection (wrong phase protection) in
one. It can be used to monitor important parameters (voltage, phase
sequence, phase loss, and phase balance) in three-phase power
supply system. It can send alarm signals in time to abnormal
conditions that may endanger the safe and reliable operation of
power systems and equipment. The system can be properly handled
before the machine equipment is more damaged, so that the machine
equipment and system can obtain the maximum degree of protection,
improve the effectiveness of the machine, equipment and system, and
reduce maintenance costs due to three-phase system failures.
Maintenance time.
♦ Features
-- Compact modular size-- Single-phase monitoring of over- and undervoltage-- Adjustable over- and undervoltage threshold-- Adjustable trip time-- Powered by the measuring circuit-- 2 C/O contact-- 3 LEDs for status indication
♦ Protective Functions
-- Overvoltage
-- Undervoltage
♦ Typical Applications
• Pumps • Fans
• Blowers • Motors
• Compressors
♦ Approvals
• CE • CCC
♦ Technical data
| Type | SVRD-W |
| Measuring circuit | L,N |
| Rated voltage | 110VAC,220VAC,240VAV,250VAC,50/60Hz |
| Monitoring functions | overvolatege, undervoltage |
| Voltage setting range | ±5%~±20% |
| Trip delay time | 1-10s adjustable |
| Indicators | overvolatege, undervoltage, and normal |
| Output contacts | 2 C/O |
| Contact capacity | 6A,250VAC |
| Dimensions (H x W x D) | 79×23×79mm |
| Mounting | DIN rail |
