CR8401-1000-G - CR Magnetics - CR Magnetics

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Last Post 03/12/2010 2:14 PM by David Lachance

CR8401-1000-G

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Tony Hodges
CRM Staff

Basic Member
Posts:154

09/04/2009 9:13 AM
We are looking for recommendations for a current sense and GFCI coils for our electric vehicle charging station. We use the Fairchild RV4141AN GFCI controller and are looking to understand the Ir rating on the three parts you offer. Does that number represent the maximum current that flows 180° out of phase in both directions through the coil or the maximum net difference that would appear as a result of a ground fault? Our product will pass a maximum of 40A AC, but a dead short ground fault condition could generate hundreds of amps until the relay opens. All we need is the ability to detect a net current of 5 mA. The CR8401-1000-G appears to work electrically, but two 10 GA wires won't fit so it looks like we'll need to go with the CR8410-1000-G. For the current sense coil, PN CR8448-2500-N looks to be the best choice. We need to detect a minimum current of 80 mA if possible

Tony Hodges
CRM Staff

Basic Member
Posts:154

09/04/2009 9:14 AM
Dear Sir, Thank you for your interest in our products. For your ground fault, the CR8410-1000-G is the recommended part if the wires can fit. The CR8401, CR8410, and CR8420 G products are all designed to work with the type of chip listed in your email, with different size openings. The CR8448 series is a good choice for sensing the level of current, however typically the CR8448-2500-N is used for power meter revenue grade designs. It has a 0.2% accuracy rating. If you are using the info for revenue, then you might need that accuracy as specified by ANSI. However, if you are just using it to indicate the amount of current, I recommend going with the CR8448-2000, which is less accurate but much less expensive. I believe you will be able to detect 80 mA with this part as well.

David Lachance

New Member
Posts:1

03/12/2010 2:14 PM
I am also using the CR8400 series, specifically the CR8420-1000-G, for a GFCI function. I am trying to calculate the tolerance stack-up to see just how accurate our circuit should be. I noticed that you mention a 0.2% accuracy for the CR8448-2500-N and that other grades are less accurate. Where did you get that accuracy information? What is the accuracy of the CR8420-1000-G? I have 2 versions of your datasheet (one with Vmax=2.0A and another with Vmax=1.7A and a new DCR column) but neither one mentions accuracy anywhere that I can see. I am trying to measure typical currents of 15mArms with a circuit-saturation at >100mArms.

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