15A solid state relay (SSR) with 70-280V AC features high structural strength, good impact resistance, and strong shock resistance. The SSR offers a reliable switching the commercial and industrial loads, such as computer peripheral interface device, printing machine, molding machine, food machine, packaging machine, and so on.
- Built in RC absorption
- Photoelectric isolation
- SCR output
- LED indicator for operation status
- Removable protective cover for safety
- Panel mount
- Zero-crossing switch type
||Control voltage range
|Max. input current
|Must operate voltage
|Must release voltage
||Load voltage range
|Maximum off-state leakage current
|Maximum off-state time
|Maximum on-state voltage drop
||Dimension L – W – H (mm)
|Dielectric strength (input to output)
|Dielectric strength (input, output to the base)
When the load current is higher than 10A, a heat sink must be installed to the solid state relay, or the SSR relay should be mounted on a metal base plate with heat dissipation effect, and the thermal grease is applied between them. When the load current is 40A or more, a fan cooling radiator or water cooling radiator must be equipped.
||Heat Sink for SSR
||Roof Size: 60 x 50mm
Foot Size: 80 x 50mm
||Mounting Hole Diameter: 3mm
Threaded Hole Distance: 48mm
||≤15A single phase SSR solid state relay
Tips: Overheat protection of solid state relays
When the SSR is on, devices will withstand the dissipated power of P = V (tube voltage drop) × I (load), where effective values of V and I are the ones of saturation voltage drop and operating current, respectively. The load capacity of solid state relays is greatly affected by the ambient temperature and its own temperature rise. It is necessary to strictly refer to the allowable temperature rise (75 ℃) of the case when the rated working current is used according to the actual working environment conditions, to reasonably select the size of radiators or reduce the current usage. In the process of installation and use, good heat emission conditions should be ensured and otherwise, overheat will lead to incontrollable situation, or even cause damage to the product.
In general, for the product with rated operating current less than 10A, the instrument baseplate with good heat emission conditions can be used. For more than 10A, radiators should be equipped with. For 30A or less, natural air-cooling is used, while for products with continuous load current greater than 30A, the fan in the instrument should be used for forced air cooling. For more than 100A, a radiator and a fan for forced cooling should be equipped with. In the installation, pay attention to good contact between the bottom of the relay and the radiator, and consider the amount of thermal grease coated appropriate to achieve the best cooling effect. If the relay works under high temperature (40 ℃ ~ 80 ℃) in a long term, the user can consider derating to ensure normal operation according to data of maximum output current and ambient temperature curve.