TRU3 - TRU Series

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Littelfuse Multifunction Relays
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The TRU Series is a multifunction, knob adjustable, Universal Time Delay Relay. It includes six of the most popular timing functions selected by a slide switch. The time delay is knob adjustable and the time delay range is switch selectable. The repeat accuracy is + 0.1%. Both function and time range can be selected on the top face of the unit. In addition to multifunctioning and multiple time ranges, the TRU Series features universal input voltage; 19 to 264VAC and 19 to 30VDC and full 10A output relay. The TRU Series can directly replace up to 1000 competitive time delay relay models.

A six position slide switch selects delay-on-make, interval, single shot, recycling (ON time first, Equal Recycle Delays), delay-on-break, and retriggerable single shot. 8-pin DPDT base wiring is limited to delay-on-make, interval, and recycling functions. All six functions are available in the 8-pin SPDT and 11-pin DPDT versions.

Property (Mouseover for details) Value
Input Voltage (V) 19 to 264VAC; 19 to 30VDC
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form Isolated DPDT
Output Load Rating (VA) 10A resistive @ 120/240VAC and 28VDC; 1/3hp @ 120/240VAC
Time Delay Type Digital integrated circuitry
Time Delay Range 0.1s - 1000m in 6 ranges: 0.1-10 1-100 or 10-1000s; 0.1-10 1-100 or 1000m
Reset Time (ms) ≤300ms
Adjustment Type Multiplier: 4 position DIP switch selects x0.1 x1 x10 or x100 and s or m; Time setting: onboard knob adjustment with 1-100 reference dial
Repeat Accuracy (%) ±0.1% or 20ms whichever is greater
Setpoint vs Ambient Temperature and Operating Voltage (%) ±2%
Indication Two LEDs indicate: 1) input voltage applied 2) output relay status
Isolation Voltage (V) ≥1500V RMS input to output
Polarity DC units are reverse polarity protected
Life Mechanical - 1 x 107; Electrical - 1 x 106
Termination Type Magnal 11-pin plug-in
Mounting Method Plug-in socket
Operating Temperature -20° to 65°C (-4°F to 149°F)
Storage Temperature (F/C) -40° to 85°C (-40°F to 185°F)
Dimensions 3.44 x 2.39 x 1.78 in. (87.3 x 60.7 x 45.2mm)
Weight (lbs/g) ≅6oz (170g)
Sample capable No