- Help Center
- Automation/Electrical
- Solid-state Relays
-
Pneumatics
- Air Cylinders
- Air Dryers
- Auto Switches
- Boosters
- Electric Actuators
- Fieldbus System/Serial Transmission System
- Fittings
- Modular F.R.L.
- Pressure Switches
- Regulators
- Rotary Actuators
- Solenoid Valve
- Temperature Control Equipment
- Vacuum Equipment
- Photoelectric Sensors
- Process Valves
- Valve Clamps and Accessories
- Pumps
- Additional Articles in Pneumatics
- Safety Valves
- Tubing
-
Hydraulics
-
Automation/Electrical
- Contact Sensors / Liquid Leakage Sensors
- Level Switches
- Basic Switches
- Limit Switches
- Push Buttons / Indicator Lamps
- Thumbwheel Switches
- Safety Limit Switches
- Temperature Controllers
- Counters
- Programmable Relays
- Programmable Controllers
- Safety Sensors
- Safety Door Switches
- Solid-state Relays
- Timers
- Inverters
- Power Supplies
- Axial Fans
- Wiring Systems
- Rotary Encoders
- Pressure Sensors
- Displacement Sensors/Measurement Sensors
- Ultrasonic Sensors
- Emergency Stop Switches
- Power Controllers
- Signal Converters
- Machine Automation Controllers
- RFID Systems
- Measuring / Motor Protective Relays
- Vision Sensors / Machine Vision Systems
- Photomicro Sensors
- Digital Panel Indicators
- Programmable Terminals
- Servomotors / Servo Drivers
- Proximity Sensors
- General Purpose Relays
-
Safety
-
Website Help Center
What are the main causes and solutions of the Solid-state Relays (SSR)'s failures?
If an inrush current exceeds the rated making current of the SSR due to the high inrush current of loads such as motors and lamps, SSR output elements are damaged.
Consider using an SSR with a higher capacity.
1. Reverse voltage of the load
High reverse voltage caused by inductive loads such as valves and solenoids may have the SSR output elements damaged.
Use the SSR with an element absorbing reverse voltage generated.
2. Malfunction caused by external surge
An external surge may suddenly damage input or output elements. A load short circuit may also cause malfunction. Design a safety circuit which will turn off the load by a contactor or a circuit breaker on the load power supply side when the SSR causes an error. It is also recommended to connect a quick-break fuse in series with the load as an over-current protection measure.
3. Installation environments
If an ambient temperature exceeds the rated value, the SSR output elements may be damaged. Install the SSR considering its heat radiation conditions such as air convection around the heat radiator.
If the SSR is used with loose screws of its output terminals or imperfect solder, abnormal heat generation while current flowing causes the SSR to burn out. Perform the proper wiring and soldering.