Alternating Relay Series - Alternating Relay

Littelfuse Alterating Timers
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The KRPS Series is a factory programmed time delay relay available with 1 of 15 functions and measures only 2 inches square. The KRPS offers a wide range of fixed, onboard, or externally adjustable time delays. The output relay contacts offer a full 10A rating with complete isolation. Its microcontroller timing circuit provides excellent repeat accuracy and stability. Encapsulation protects against shock, vibration, and humidity. The KRPS Series is a cost effective approach for OEM applications that require small size, isolation, accuracy, and long life. Special time ranges and functions are available.

Operation (Alternating)
Input voltage must be applied at all times for proper operation. The operation begins with the output relay de-energized. Closing S1 enables the next alternating operation. When S1 opens (trailing edge triggered), the time delay begins. At the end of the time delay, the output energizes and remains energized until S1 is (re-closed and) re-opened. Then the output relay de-energizes and remains until S1 opens again. Each time S1 opens the time delay occurs and the output transfers.
Reset: Removing input voltage resets the output and the time delay.

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)
Storage Temperature (F/C)Time Delay RangeDimensionsStockCompare
KRPSA10.1SFT24 or 240 V ac/dcSPDT-40° to 85°C (-40° to 185°F)0.1 s fixed2 H x 2 W in. (50.8 x 50.8 mm)Check
KRPSD10.1SF12 or 48 V dcSPDT-40° to 85°C (-40° to 185°F)0.1 s fixed2 H x 2 W in. (50.8 x 50.8 mm)Check
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