Рет қаралды 182
A solid state relay (SSR) has no moving parts. It is a transistor activated by a small AC or DC control signal produced by the temperature controller. This type of relays can switch up to several hundred amps in less than a second. They're used for heaters with low mass like radiant heaters (but not quartz tubes and quartz lamps which require a silicone controlled rectifier) and air heaters which require very frequent power switching. Solid state relays are usually mounted on a heat sink to dissipate the heat they generate. If several of these relays are mounted in a control panel, ventilation or even cooling of the control panel may be necessary.
Advantages over electro-mechanical relays:
1. Faster reaction time
2. Increased life time of relay and heater
3. No sparking during turn on
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