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Last Post 07/24/2018 4:11 PM by  Joe Schlereth
cr9350-aca
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jim dayringer
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04/27/2010 6:19 PM
    I'm using a cr9350-aca to energize a small interposing relay with a 120V coil and power draw of 9ma. Will I need a snubber circuit? I found an old cut sheet for the cr9321-aca that showed a 2k ohm resistor and a .1uf capacitor as a recommended snubber. When I tried this it made the relay coil hum. The operation in either case was the same. Do I need the snubber to protect the current switch? Thanks
    Tony Hodges
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    04/28/2010 11:01 AM
    Dear Sir,

    Thank you for the question. Please check and make sure you have enough current going throught he ring to activate the switch. Make sure you are not using a DC coil. From the specs you provided the unit should turn on without a snubber unit. You would need a snubber unit to turn it off. The recommended circuit is a resistor and capacitor in series across the wires of the device. A 0.01 microfarad capacitor rated 400 volts and a 100 ohm 1/8 watt resistor.

    I have attached our catalog page for your review with the wiring specs. There is a wiring diagram on the bottom. Please check to make sure it is wired properly.
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    jim dayringer
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    04/29/2010 1:10 PM
    The switch will be used to sense current from woodworking tools. When I tested it, it seemed to turn on and off without any problems. The interposing relay coil is 120VAC with a 9ma power draw. Do I still need the snubber? Thanks
    Tony Hodges
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    04/29/2010 2:33 PM
    You need a snubber unit to turn it off. The recommended circuit is a resistor and capacitor in series across the wires of the device. A 0.01 microfarad capacitor rated 400 volts and a 100 ohm 1/8 watt resistor.
    Nathaniel Tempest
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    07/23/2018 12:35 PM
    I have a similar situation I'm designing for. Won't the parallel path across the switch allow some current flow even when its off? Can the snubber go across the relay coil instead?
    Joe Schlereth
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    07/24/2018 4:11 PM
    Hello Nathaniel,

    Thank you for your interest.

    There will be alittle current. However, the CR9350-ACA should turn off before 100mAAC and I would not imagine the current would be stuck above 100mAAC in a parallel path.

    In fact, you can use a snubber either across the secondary leads of the ACA CR9350 or across the relay.

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