Current Switch 0.350 trip point · Max sensing PNP transistor output Self-powered CR Magnetics CR9321-PNP
Self-powered fixed set-point current switch for on-off indication of AC current flow, with PNP transistor output for DC switching. Rated full-on at 0.350 A AC RMS with 100 A AC continuous sensing and a 0.27 in (6.9 mm) window for conductor pass-through.
What this product is for
The CR9321-PNP is a fixed set-point current switch used to detect AC current flow and provide an on-off output signal to a PLC, controller, or relay interface. It is self-powered from the sensed conductor, so no separate supply is required for the sensing function.
Use for
Use for proof-of-flow, fan and pump status, heater status, belt loss indication, and other control-panel applications where you need a simple current present or current absent signal. The PNP transistor output is intended for DC switching and can be wired to compatible control inputs.
Avoid for
Avoid using this model where the normal operating current stays below the rated full-on level of 0.350 A AC RMS, since the output may not drive fully on below that point. Avoid direct connection to inductive DC loads without a customer-supplied clamping diode, or AC inductive loads without a snubber network.
Best for
Best for electricians and control contractors who need a low-cost isolated current status switch with a compact 0.27 in (6.9 mm) sensing window and PNP output for DC control circuits.
Installed in
Typically installed in control panels, OEM equipment, HVAC panels, motor status circuits, and automation enclosures where a conductor can be passed through the sensing window.
Why this product exists
This current switch provides a simpler alternative to using a separate current transformer and relay logic when only an on-off indication of current flow is needed. It helps confirm whether a load is operating without making a direct electrical connection to the monitored conductor.
Compared with similar products
Compared with adjustable current switches, this model uses a fixed trip point for straightforward installation. Compared with larger-window models, the CR9321-PNP has a 0.27 in (6.9 mm) window suited to smaller conductors. The PNP version is selected when the control scheme requires a PNP transistor output rather than NPN or AC output.
Specifications
- Brand: CR Magnetics
- Manufacturer part number: CR9321-PNP
- Series: CR9300
- Product type: Current switch
- Output type: PNP transistor output for DC switching
- Operation: Self-powered, fixed set-point
- Rated full-on level: 0.350 A AC RMS
- Maximum sense current: 100 A AC continuous
- Maximum sense current for 1 second: 500 A AC
- Sensing window: 0.27 in (6.9 mm) diameter
- Frequency: 50 to 400 Hz
- Turn-on time: 100 ms maximum at rated full-on
- Turn-off time: 250 ms maximum to 80% of Vce
- DC switching Vce full off: 30 V DC maximum
- DC switching current full on: 120 mA DC maximum at rated full-on
- Vce full on: 1.5 V DC at 120 mA DC sink current
- Off-state leakage current: 5 uA typical at 30 V DC
- Operating temperature: -30 deg C to 60 deg C (-22 deg F to 140 deg F)
- Storage temperature: -55 deg C to 85 deg C (-67 deg F to 185 deg F)
- Isolation: Fully isolated
- OperationSelf-powered, fixed set-point
- SeriesCR9300
- Operating Temperature-30 deg C to 60 deg C (-22 deg F to 140 deg F)
- Frequency50 to 400 Hz
- Output TypePNP transistor output for DC switching
- IsolationFully isolated
- Storage Temperature-55 deg C to 85 deg C (-67 deg F to 185 deg F)
- BrandsCR Magnetics Inc
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