The IDEC RU range contains four-pole universal relays with a latching lever and LED indicator. The SY4S entry identifies the socket family, but remains unverified because the legacy code omits its full ordering suffix.
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RU4S-A110 is an IDEC RU plug-in power relay with 4 poles, 4PDT (4C) contacts and a 110–120 V AC coil. It includes an LED operation indicator and has a 6 A contact rating.
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RU4S-A220 is an IDEC RU plug-in power relay with 4 poles, 4PDT (4C) contacts and a 220–240 V AC coil. It includes an LED operation indicator and has a 6 A contact rating.
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RU4S-A24 is an IDEC RU plug-in power relay with 4 poles, 4PDT (4C) contacts and a 24 V AC coil. It includes an LED operation indicator and has a 6 A contact rating.
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RU4S-D110 is an IDEC RU plug-in power relay with 4 poles, 4PDT (4C) contacts and a 110 V DC coil. It includes an LED operation indicator and has a 6 A contact rating.
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RU4S-D12 is an IDEC RU plug-in power relay with 4 poles, 4PDT (4C) contacts and a 12 V DC coil. It includes an LED operation indicator and has a 6 A contact rating.
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RU4S-D24 is an IDEC RU plug-in power relay with 4 poles, 4PDT (4C) contacts and a 24 V DC coil. It includes an LED operation indicator and has a 6 A contact rating.
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SY4S is a legacy code identifying the IDEC four-pole relay-socket family. The exact terminal/mounting suffix is absent from the legacy record, so the precise variant is not verified.
View technical details →This information applies at series level. Check the model record and manufacturer documentation for model-specific values.