[Features] · Features a voltage sensor optimal for voltage detection alarm applications. · A version with a timer function has been added to the series. · A single operation type (SDV-F type) of over-voltage detection or under-voltage detection (switchable with a switch) and a dual operation type (SDV-D type) are available. · On-delay / off-delay / power-on activation lock timer (switchable with a switch). · A single operation type with timer function equipped with an operation function has been added to the series (SDV-FHT type). · By combining with the flow divider SDV-SH type, · overcurrent and undercurrent are also detectable. · For AC voltage and DC voltage (SDV-F type and -D are both switchable with a switch). · Dedicated product for small DC inputs (SDV-FL type) is switchable between DC with polarity and without polarity. · The return value is settable with a wider settable range (2 to 30% SDV-F type). · Equipped with a light emitting diode for operation displays convenient for operation checks (SDV-F type, -D). · Obtained conformity with UL and CSA safety standards (SDV-F type).