Current switch sensor · 100A sensing ACA output Self-powered · CR Magnetics CR9321-ACA
Self-powered AC current switch for on-off proof of current flow in control and monitoring circuits. This CR9300 series unit senses up to 100A AC continuous, uses an SCR output for AC switching, and has a 0.27 in (6.9 mm) solid-core window for single-conductor pass-through.
What this product is for
This solid-core current switch is used to detect AC current flow and provide a simple on-off output for control, status, and proving applications. It is commonly connected to a PLC input, relay interface, or monitoring circuit where a self-powered current switch is preferred.
Use for
Use for fan and pump status, belt-loss indication, electric heater proving, lighting circuit monitoring, and other applications where you need confirmation that AC current is present. The 0.27 in (6.9 mm) window suits single-conductor pass-through installations.
Avoid for
Avoid using this device where the monitored current normally operates below the rated full-on level of 0.350 A AC RMS, because output performance is reduced below that threshold. Avoid direct connection to inductive AC loads without an appropriate snubber network.
Best for
Best for electricians and control contractors who need a compact, low-cost, isolated current proving switch with no external power supply. It is a practical choice when AC switching output is required instead of NPN or PNP DC output.
Installed in
Typically installed in control panels, OEM equipment, HVAC panels, motor control assemblies, and monitoring enclosures. The solid-core body is suited to new work where the conductor can be passed through the sensing window during installation.
Why this product exists
This product provides a simple way to confirm current flow without adding a powered transducer or more complex metering device. It helps prove equipment operation and trigger control logic from actual load current rather than assumed command status.
Compared with similar products
Compared with adjustable current switches, this model uses a fixed trip design for straightforward selection and repeatable installation. Compared with split-core sensors, the solid-core format is more compact but requires conductor access during installation. This -ACA version is for AC switching SCR output; NPN and PNP variants are used where DC transistor output is needed.
Specifications
- Manufacturer part number: CR9321-ACA
- Brand: CR Magnetics
- Series: CR9300
- Product type: Current switch sensor
- For measuring: AC current
- Output type: SCR for AC switching
- Supply requirement: Self-powered
- Rated full-on level: 0.350 A AC RMS
- Maximum sense current: 100 A AC continuous; 500 A AC for 1 second
- Frequency: 50 to 400 Hz
- Turn-on time: 100 ms max
- Turn-off time: 250 ms max
- Off-state voltage: 240 VAC RMS max
- Minimum switch voltage: 24 VAC RMS
- On-state current: 0.8 A AC RMS max continuous
- Off-state leakage: 50 uA at 240 VAC max
- Peak non-repetitive surge current: 8 A AC RMS, 1 cycle at 60 Hz
- Operating temperature: -30 degC to 60 degC (-22 degF to 140 degF)
- Window size: 0.27 in (6.9 mm) diameter
- Lead wires: 22 AWG, 12 in (305 mm) long
- Isolation: Fully isolated
Typical buying note: this style of current switch is commonly used for proof-of-operation rather than precision measurement. Actual performance depends on conductor position, load profile, switching interface, and installation conditions.
- SeriesCR9300
- Operating Temperature-30 degC to 60 degC (-22 degF to 140 degF)
- Frequency50 to 400 Hz
- Output TypeSCR for AC switching
- IsolationFully isolated
- BrandsCR Magnetics Inc
- Stock in Elmira1
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