THDB421A
Littelfuse Relays, THDB Series

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THDB421A Littelfuse Relays, THDB Series, Delay on Break Timer, 120VAC, Adj,
MFG Item Number
THDB421A
Littelfuse
main product photo

THDB421A Littelfuse Relays, THDB Series, Delay on Break Timer, 120VAC, Adj,

MFG Item Number
THDB421A
Littelfuse
Series
THDB
More specs
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Description

Relays, THDB Series
Item #
THDB421A
Delay on Break Timer, 120VAC, Adj,

THDB Series Information

  • High Load Currents up to 20A, 200A Inrush
  • Fixed or Adjustable 0.1s‑1000m in 6 Ranges
  • ±0.5% Repeat Accuracy
  • ±1% Factory Calibration
  • 24, 120, or 230VAC
The THDB Series combines accurate timing circuitry with high power, solid‑state switching. It can switch motors, lamps, and heaters directly without a contactor. You can reduce labor, component cost, and increase reliability with these small, easy‑to‑use, Digi‑Power timers.

Operation (Delay‑on‑Break): Input voltage must be applied before and during timing. Upon closure of the initiate switch, the output energizes. The time delay begins when the initiate switch is opened. The output remains energized during timing. At the end of the time delay, the output de‑energizes. The output energizes if the initiate switch is closed when input voltage is applied. Reset: Reclosing the initiate switch during timing resets the time delay. Loss of input voltage resets the time delay and output.

  • Metallized Mounting Surface for Heat Transfer
  • Totally Solid‑State & Encapsulated

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Specifications

Specifications
Manufacturer Part Number THDB421A
Manufacturer Littelfuse
Product Series THDB
Family Series Littelfuse Relays, THDB Series
Description Delay on Break Timer, 120VAC, Adj, 1-100 Sec Adj, 1/4in. Fast-On Termft.s, 6A Output, Ext Adjust, Digi-Power
Operation Off Delay
Contacts 1NO
Mounting Surface
Time Range Adjustment Remote
Timing Range 1-100 s
Max Time 100 s
Time Tolerance 1 %
Coil Voltage 120 VAC
Nominal Coil Voltage 120 VAC
Contact Rating 6 A
Termination 0.250 in Flat Blade
Approvals CE, CSA, UL
Net Weight 0.185 lbs
Gross Weight 0.22 lbs