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Load Type
Fans / Motors
Incandescent / Halogen
LED Feedback
Outdoor Rated
Water Resistant
# of Relays
1 Relay
110V AC
120V AC
277V AC
Ease of Installation
Intermediate (Installs < 60 minutes)
Functional Devices
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10 Amp SPDT Time Delay Relay for Multiple Applications
Functional Devices RIBD2421C Enclosed SPDT Time Delay Relay, 10 Amp
Functional Devices RIBD2421C Enclosed SPDT Time Delay Relay, 10 Amp
Functional Devices RIBD2421C Enclosed SPDT Time Delay Relay, 10 Amp
Item# 55906
Customers rated this product 4 Stars
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Price: Normally $29.22 
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  • Consolidate work space and wiring
  • Save time and money on installation
  • Weatherproof enclosure
  • Multiple timing options
  • Great for HVAC applications

Essential Info

The RIBD2421C by Functional Devices Inc. is one of their many Pilot Series relays. This unit specifically, is a single pole, double throw timer relay housed in a weatherproof enclosure. The Pilot Series relays have been configured with all of the essential components saving the installer the time and hassle of having to piece them all together themselves. Having to assemble these components on the job (relay, LED indicator, socket mounting rail, transient protection, and housing) may become an issue if a component is missing, damaged, or defective. By saving you time it is saving you money. Time you would have normally spent assembling them at a shop or on a job site, is now open to complete more jobs.

This item is intended to power load 2 for a designated period of time after load 1 has been switched off. HVAC applications are very common for this item. For example, keeping a circulating fan running after a thermostat controlled HVAC system has shut off. This can be very useful in a home with hot or cold spots. The temperature sensor for the HVAC system may trigger it to shut off while certain parts of the home have not been completely cooled or warmed. The sensor is accurately responding it is just not monitoring enough space to know it is failing to create a constant temperature throughout the entire home. Having a fan continuing to circulate the air gives you a much better chance of getting your entire house comfortably sustaining a constant temperature.



ManufacturerFunctional Devices
Manufacturer Product No.RIBD2421C
Expected Relay Life10 million cycles minimum mechanical
Operating Temperature-30 to 140° F
Humidity Range5 to 95% (noncondensing)
Operate Time6mS after time delay
Relay StatusRED LED On=Activated
Time Delay StatusPINK LED FLASHING=Timing
Timing Mode433MHz ISM
Timing Range6 seconds - 20 minutes
Timing Adjustment4 position DIP switch for range selection and single turn potentiometer for timing adjustment within range
Timing ToleranceSwitches 1& 2=+10% Switches 3 & 4=+5%
Recycle Time750ms Maximum
Dimensions4.00½ x 4.00½ x 1.80½ with .50½ NPT nipple
Wires16½, 600V Rated
ApprovalsUL Listed, UL916, UL864, C-UL California State Fire Marshal, CE, RoHS
Housing RatingUL Accepted for Use in Plenum, NEMA 1
Contact Ratings10 Amp General Use @ 277 Vac, 10 Amp Resistive @ 30 Vdc N/O, 7 Amp Resistive @ 30 Vdc N/C, 1/2 HP @ 125 Vac, 1 HP @ 250 Vac, 1/4 HP @ 277 Vac, C300 Pilot Duty
Input Current110 mA @ 24 Vac, 33 mA @ 24 Vdc, 61 mA @ 120-277 Vac
Coil Voltage Input24 Vac/dc ;120-277 Vac ;50-60 Hz, Drop Out=3 Vac / 3.8 Vdc, Pull In=20 Vac / 20 Vdc

Important notes:
Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
Manufacturer contact information: Functional Devices Inc, Tel: (765) 883-5538


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