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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 Allowes 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 Hocky 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.
Hocky puck style SSR thermal transfer pads are highly recommended for proper relay installations.
Reference: SSRT-240D25
Brand: Potter & Brumfield
Zero Cross Fire Back to Back SCR Design Hocky Puck Style 1.75"w X 2.25"L X 0.87"H Maximum I²T Fusing Is 937A²Seconds Line Voltage Max. 280Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance 1.7°F C/W Snubberless Traic Output Single Pole Double Throw
Reference: SSR-240-40A-AC1
Brand: Watlow Electric Mfg.
Zero Cross Fire Back to Back SCR Design Hocky Puck Style Maximum I²T Fusing Is 1620A²Seconds Line Voltage 24~240Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance .63°F C/W Internal Voltage Snubber Includes Thermal Foil, Washers, And Screws For Mounting To A Heat Sink Equal to Crydom A2440DEH and Potter & Brumfield SSRT-240A40
Reference: SSR-240-10A-AC1
Brand: Watlow Electric Mfg.
Zero cross fire Back to back SCR design Maximum I²T fusing is 60A² seconds Line voltage 24~240Vac Ambient operating temperature -40°F to +176°F Thermal resistance 1.48°F C/W Internal voltage snubber Equal to Crydom A2410 and Potter & Brumfield SSRT-240A10
Reference: SSR-240-25A-DC1
Brand: Watlow Electric Mfg.
Zero cross fire Back to back SCR design Maximum I²T fusing is 260A²seconds Line voltage 24~240Vac Ambient operating temperature -40°F to +176°F Thermal resistance 1.05°F C/W Internal voltage snubber Includes thermal foil, washers, and screws for mounting to a heat sink Equal to Crydom D2425 and Potter & Brumfield SSRT-240D25
Reference: SSR-25DA
Brand: Ruike Electronic Industrial Co., LTD
Zero Cross Fire Back to Back SCR Design Hocky Puck Style Maximum I²T Fusing Is 960A²Seconds Line Voltage 24 ~ 480Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance 0.63°F C/W
Reference: SSR-240-10A-DC1
Brand: Watlow Electric Mfg.
Zero cross fire Back to back SCR design Maximum I²T fusing is 60A²seconds Line voltage 24~240Vac Ambient operating temperature -40°F to +176°F Thermal resistance 1.48°F C/W Internal voltage snubber Includes thermal foil, washers, and screws for mounting to a heat sink Equal to Crydom D2410 and Potter & Brumfield SSRT-240D10
Reference: SSR-480-50A-DC1
Brand: Watlow Electric Mfg.
Zero Cross Fire Back to Back SCR Design Hocky Puck Style Maximum I²T Fusing Is 1620A²Seconds Line Voltage 24~530Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance 0.63°F C/W Internal Voltage Snubber Includes Thermal Foil, Washers, And Screws For Mounting To A Heat Sink Equal to Crydom D4850DEH and Potter & Brumfield SSRT-480D50
Reference: CMD6050
Brand: Crydom
Zero Cross Fire Back to Back SCR Design Maximum I²T Fusing Is 1620A²Seconds Line Voltage 48 ~ 660Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance 0.63°F C/W Internal Voltage Snubber
Reference: RSSAN-25A
Brand: IDEC
Zero Cross Fire Back to Back SCR Design Control Voltage 90 ~ 280Vac Pick Up Voltage 90Vac Drop Out Voltage 10Vac Line Voltage 48 ~ 650Vac Snubbed For 0.5 Power Factor At Rated Load Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance 1.5°C/W LED Indicator
Reference: SSR-240-40A-DC1
Brand: Watlow Electric Mfg.
Zero Cross Fire Back to Back SCR Design Hocky Puck Style Maximum I²T Fusing Is 1620A²Seconds Line Voltage 24~240Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance .63°F C/W Internal Voltage Snubber Includes Thermal Foil, Washers, And Screws For Mounting To A Heat Sink Equal to Crydom D2440DEH and Potter & Brumfield SSRT-240D40
Reference: SSR-480-25A-DC1
Brand: Watlow Electric Mfg.
Zero cross fire Back to back SCR design Maximum I²T fusing is 260A²seconds Line voltage 24 ~ 530Vac Nominal 480vAC Ambient operating temperature -40°F to +176°F Thermal resistance 1.02°F C/W Includes thermal foil, washers, and screws for mounting to a heat sink
Reference: SSR-240-50A-DC1
Brand: Watlow Electric Mfg.
Zero Cross Fire Back to Back SCR Design Hocky Puck Style Maximum I²T Fusing Is 1620A²Seconds Line Voltage 24~240Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance 0.31°F C/W Internal Voltage Snubber Includes Thermal Foil, Washers, And Screws For Mounting To A Heat Sink Equal to Crydom D2450DEH and Potter & Brumfield SSRT-240D50
Reference: A2440
Brand: Crydom
Zero Cross Fire Back to Back SCR Design Hocky Puck Style Maximum I²T Fusing Is 1620A²Seconds Line Voltage 24 ~ 280Vac Ambient Operating Temperature -40°F ~ 176°F Thermal Resistance .45°F C/W
