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The AC current sensing switch uses the principle of mutual induction to sense AC, isolate AC current, and output normally open or normally closed switch signals. Compared with traditional transformers, thermal protectors, etc., it can detect and control more accurately and timely.
What will I get?
Type: Normally Open (N.O.)
Rated load: 0.3A@240V AC/DC
Monitoring current: 0-30A AC
Tape phenomenon: Response time: Working temperature: -20~55°C
Dimensions: 65x47x25mm/2.6x1.8x0.98 inch
Package contains: 2pcs x Current Monitoring Relays + 2pcs Screwdriver+ 4pcs Screws
Are there any advantages of the product?
LED indication: The action current is 0-30A AC, and the sensor switch is equipped with an LED indicator light, which can intuitively see the working status of the switch
ABS material: The sensor monitoring relay shell uses ABS fireproof material, which is heat-resistant, high in impact strength and stable in performance.
High performance: The switch has no limit on the number of times it is opened and closed, and the response speed is extremely fast, with a response time of
How to use it?
Normally open type: When no current is sensed, the normally open contact is always in the disconnected state; when current is sensed, the normally open contact is always in the connected state.
Normally closed type: When no current is sensed, the normally closed contact is always in the connected state; when current is sensed, the normally closed contact is always in the disconnected state.
What should I notice?
Please use the current sensing relay at the rated voltage and current, and do not exceed the rated current.
D. Grundmann
Reviewed in the United States on April 20, 2025
Summary:This passive AC sense module is a straightforward solution for managing a secondary load based on AC current detection. It operates silently and mounts easily, making it ideal for integration into custom projects. While it requires a minimum current to trigger and lacks intelligent logic to handle fluctuating loads, it performs well under expected use conditions.Pros:+ Simple and easy-to-use design for passive AC sensing+ Supports switching secondary loads reliably above 0.2A+ Silent operation with no audible relay click+ Straightforward mounting to a project box or custom areaCons:- No intelligent triggering logic; can enter a flutter state with borderline loads from sense adjustmentNotes:* Requires a minimum of 0.2A to function, and very low loads may not register* A short delay exists during transitions unless there's a substantial load present* Behavior varies slightly with square wave inputs from inverters or UPS unitsTakeaway:An effective and silent AC sense switch perfect for passive load control projects, but best used with stable loads above its detection threshold to avoid oscillation.
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