AC control circuits
Replaces a 24 V switch plus a relay where the panel is 110 or 230 V AC.
Contact type · 10–240 V AC/DC · 10 W
C-Series Spring-Type Magnetic Switches (CMSJ / CMSG / CMSE / CS1 / 3045)
Reed-type magnetic switches for cylinders and actuators: 60–800 Gauss, 10–240 V AC/DC, 100 mA and 10 W, in a body that fits the same grooves as the electroni
Model CMSJ · CMSG · CMSE · CS1-F · CS1-U · 3045 · Brand LE Raun · Category: Magnetic Sensors
Sensitivity60 – 800 Gauss
Voltage10 – 240 V AC/DC
Load10 W
ProtectionIP64
Overview
A reed switch is two ferromagnetic blades sealed in a glass tube. A magnetic field makes the blades touch; the field goes away and the spring in the blades separates them. The contact itself needs no supply — the circuit it closes provides the signal — which is why a reed switch can sit directly in a 230 V AC control circuit.The C series is that principle in a cylinder-groove body: 60–800 Gauss sensitivity, 10–240 V AC/DC, 100 mA and 10 W maximum, 200 Hz switching frequency, 50 G shock and 9 G vibration, −10 to +70 °C and IP64. There is no protection circuit in the body, so an inductive load needs its own suppression.The trade against the D series is straightforward. The C series takes AC, carries 10 W and needs no supply of its own; the D series switches 1000 Hz, draws 2.5–100 mA from a 10–28 V rail and has no contact to stick. Choose by the circuit that already exists, not by a switching speed the application will never use.
Application scenarios
Cylinder end positions
Reports open and closed on a clamp or an ejector.
Valve and damper limits
Two switches set the travel limits on a rotary actuator.
Gate and guard position
Reports that a gate is shut, for the machine sequence rather than as a certified interlock.
Legacy machine retrofit
The 10–240 V AC/DC range drops into an existing AC circuit without changing the panel.
Industries
- General machinery
- Packaging
- Automotive
- Assembly
Technical specifications
| Sensor switch type | Contact type (reed) |
|---|---|
| Sensing sensitivity | 60–800 Gauss |
| Supply voltage | 10–240 V AC/DC |
| Max. switching current | 100 mA |
| Max. contact capacitance | 10 W max. |
| Max. switching frequency | 200 Hz |
| Shock resistance | 50 G |
| Vibration resistance | 9 G |
| Protection circuit | None — an inductive load needs its own suppression |
| Operating temperature | −10 to +70 °C |
| Protection level | IP64 |
| Indicator lamp | Red LED |
| Cable | 2-core or 3-core, oil-resistant grey PVC |
| Product application | Determines quantity and mounting position according to cylinder control requirements |
| Switching voltage | AC/DC 100 V max. (reed), 24 VDC (solid state) |
| Response time | ≤1 ms |
Dimensions
| Item | Value |
|---|---|
| Cable | 2.8 mm, 2- or 3-core, oil-resistant grey PVC |
| Cable length | 1 / 3 / 5 m |
| Sensing distance | 60 – 80 gauss operating point |
Reed switches are sold against a magnet, not against a distance: the 60–80 gauss figure is the field the switch needs, so a smaller magnet has to sit closer.
Wiring & output
| Lead | Colour |
|---|---|
| 2 | Blue |
| — | 3-wire types |
How to specify
- 01
Match the switch to the cylinder groove
Cylinders differ in groove shape: a C-groove, a round groove or a tie-rod. The switch body is shaped for one of them, and no bracket will make a C-groove switch hold in a round groove.
- 02
Choose reed or solid state
A reed contact is cheap and works on AC or DC, but it bounces and welds under inrush. A solid-state switch has no moving contact — the right choice on a high-cycle line or in a weld field.
- 03
Decide 2-wire or 3-wire
2-wire is simplest for a PLC input in series with the load; 3-wire gives a defined output and a shorter response time.
- 04
Check the actuation zone
The switch operates over a band along the stroke, not at a point. Where the repeatability matters, order the narrow-band version and set it at mid-stroke.
Why this series
Works straight into 110 / 230 V AC
A 10–240 V AC/DC rating means the switch can sit in an AC control circuit without a relay or a 24 V supply — which is why reed switches are still specified on older machines.
10 W of load, not 2.8 W
The contact carries 100 mA and switches 10 W, enough to drive a small relay or a lamp directly where an electronic switch would need an interface.
200 Hz is enough for a cylinder
A reed contact is slower than a magnetoresistive one, but a pneumatic cylinder cycling at a few hertz does not need more.
IP64 with a red LED
Dust-tight and splash-resistant, with the indicator at the switch so the point can be seen during setup.
Questions
Reed or magnetoresistive?
Reed if the circuit is AC, if 10 W of load is needed, or if there is no 24 V supply available. Magnetoresistive (D series) if the cycle rate is high, the switch will see millions of operations, or contact bounce would upset the controller.
Do I need a flyback diode?
Yes for a DC relay or solenoid coil. There is no protection circuit inside the C-series body, so an unsuppressed coil will arc the contacts and shorten their life. On AC, use an RC snubber across the coil.
What is the difference between CS1-F and CS1-U?
The catalogue lists them as separate part numbers with the same electrical specification — 10–240 V AC/DC, 100 mA, 10 W, 60–800 Gauss — so the difference is the body rather than the contact rating. Confirm the groove width against the cylinder before ordering.
Need a quotation for C-Series Spring-Type?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.