ERDM123 - ERDM Series

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Littelfuse Delay on Make Relays
The ERDM Series are a combination of digital electronics and a reliable electromechanical relay. These devices offer a DPDT relay output for relay logic circuits, and isolation of input to output voltages. Cost effective for OEM applications, such as random starting, sequencing ON, switch de-bouncing, anti-short cycling, and other common delay-on-make applications.


Operation (Delay-on-Make)
Upon application of input voltage, the time delay begins. The output is de-energized before and during the time delay. At the end of the time delay, the output energizes and remains energized until input voltage is removed.
Reset: Removing input voltage resets the time delay and output.

Property (Mouseover for details) Value
Input Voltage (V) 12VDC
Input Tolerance (%) -15% - 20%
Output Type Isolated relay contacts
Output Form DPDT
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 120/240VAC
Time Delay Type Digital integrated circuitry
Time Delay Range 0.3s - 30s adjustable
Time Delay Tolerance (%) ±10%
Recycle Time (ms) ≤150ms
Adjustment Type Onboard knob
Repeat Accuracy (%) ±0.5%
Setpoint vs Ambient Temperature and Operating Voltage (%) ≤ ±2%
Insulation Resistance ≥100 MΩ
Isolation Voltage (V) ≥1500V RMS input to output
Polarity DC units are reverse polarity protected
Life Mechanical - 1 x 107; Full load - 1 x 106
Termination Type 0.25 in. (6.35mm) male quick connect terminals
Mounting Method Surface mount with two #6 (M3.5 x 0.6) screws
Operating Temperature -40° to 65°C (-40°F to 149°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Dimensions 3.50 x 2.50 x 1.75 in. (88.9 x 63.5 x 44.5 mm)
Weight (lbs/g) ≅5.7oz (162g)
Sample capable No