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Solid state relays should last for many years if properly protected. Watlow solid state relays include an internal voltage snubber for protection from fast transient voltages. SSRs require a small voltage to switch their load. The heat generated by the relay's switching action can accumulate depending on the cycle time and reduce the life of the relay. This heat should be removed by mounting the SSR on an appropriately sized heat sink. The relay should also be protected with Semiconductor Fuses which can open in tenths of a millisecond during a high fault short. The fuse amp rating should be 125% of the relay’s load current.
Reference: KS-100
Clear Polycarbonate Protective Cover Fits Hockey Puck Style Solid State Relays Made Simple To Install
Reference: RPC-5399-42-000
Brand: Watlow Electric Mfg.
Designed For Zero Cross Type Solid State Relays With DC Control Mounts Directly On The Relay Control Terminals Operates From A Standard Instrumentation Signal Of 4 ~ 20mA Utilizes A Time Proportional Cycle Rate Of Less Than One Second 4V-AC Cycles On And 4V-AC Cycles Off At 50 Percent Power Allows Using High Watt Density Heaters With Fast Cycling
Reference: Z100-0815-000B
Brand: Watlow Electric Mfg.
Aluminum Body With A Black Anodized Finish Rated At 1.1°C/W Designed For Use With Hockey Puck Style Solid State Relays Width 3.2"(81mm) x 3.7"(94mm) Long x 2.9"(74mm) High Din Rail Mounted OR Base Mounted Relay Mounting Holes Are 8/32 Threads Removes Heat Away From Solid State Relays
Reference: 0830-0574-0000
Brand: Watlow Electric Mfg.
Hockey puck style SSR thermal transfer pads are highly recommended for proper relay installations.
