Omron WLCA12-TH-N — WL-N Limit Switch, Heat-Resistant
SKU: WLCA12-TH-NUSD 33.00
WL-N 2-circuit limit switch, adjustable roller lever, heat-resistant body, neon operation lamp, IP67.
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Product Overview
The Omron WLCA12-TH-N is a 2-circuit limit switch in the WL-N series, with an adjustable roller lever actuator, a heat-resistant body, and a neon operation indicator on the housing. The 'WL' marks the WL general-purpose line, 'CA12' marks a side-rotary adjustable roller lever, 'TH' marks the heat-resistant version (to +120 °C body), and 'N' marks the neon operation lamp. The switch carries two SPDT contacts rated at 10 A (250 VAC), with a mechanical life of 15 million operations and an electrical life of 750,000 operations at rated load. It is the standard pick for end-of-stroke, gate-position, and damper-position detection on ovens, foundries, and other high-ambient machines.
Why heat-resistant and a lamp
The TH body uses a high-temperature housing and seal that survive +120 °C ambient. A standard WLCA12-N is rated to +80 °C; TH is the right pick near ovens, steam lines, and curing cabinets. The neon lamp (N) lights when the actuator trips the switch, so the operator can confirm the trip from across the machine without opening the cabinet. For an LED version (lower-power, brighter), look at the WLCA12-LD-N.
Roller lever options
The CA12 code marks the standard side-rotary actuator with an adjustable roller lever. The roller can be repositioned along the lever arm to change the operating position and force, and the lever can be set to actuate in either direction. For a sealed top plunger, use the WLCA12 (no suffix). For a fork lever (two-way), use the WLCL. For a sealed roller plunger, use the WLCA2 series.
Before ordering
Confirm the actuator is the right shape: the CA12 is a side-rotary roller lever. Confirm the ambient stays below +120 °C (TH rating). For lower-temperature panels, the standard WLCA12-N is a more cost-effective pick. Order the conduit connector and gasket to match the cable gland on the panel. Allow space for the lever arm to swing through its full overtravel.
Key Features
- WL-N 2-circuit general-purpose limit switch
- Adjustable roller lever actuator (CA12)
- Heat-resistant body to +120 °C ambient (TH)
- Neon operation indicator on the housing (N)
- Two SPDT contacts, 10 A at 250 VAC
- IP67 protection rating, die-cast aluminium body
- 15 million mechanical operations, 750,000 electrical
- SKU: WLCA12-TH-N
- Series: WL-N general-purpose limit switch
Best-Fit Applications
- End-of-stroke detection on oven doors and curing cabinet gates
- Damper position feedback on high-temperature process exhaust lines
- Conveyor transfer arm position on a foundry or casting line
- Limit switch on a packaging machine near a heat-seal station
- Gate-position feedback on a steriliser or autoclave cabinet door
Buying Checklist
- Choose WLCA12-TH-N for the heat-resistant body and neon operation lamp.
- Choose WLCA12-LD-N for an LED indicator on the same switch.
- Choose WLCA12-N for the standard version rated to +80 °C ambient.
- Choose WLCA12-2N-N for the double-pole version with a side-rotary lever.
- Confirm the ambient stays below +120 °C for the TH rating.
- Allow for the lever arm to swing through its full overtravel.
Technical Specifications
| Series | WL-N general-purpose limit switch |
|---|---|
| Actuator | Side-rotary adjustable roller lever (CA12) |
| Contact Form | 2 x SPDT (2NO + 2NC), double-break |
| Contact Rating | 10 A at 250 VAC, 6 A at 30 VDC |
| Mechanical Life | 15 million operations min. |
| Electrical Life | 750,000 operations min. at rated load |
| Operating Temperature | -10 to +120 °C (TH heat-resistant) |
| Protection Rating | IP67 (IEC 60529) |
| Operation Indicator | Neon lamp (lit when NC contacts open / NO contacts close) |
| Operating Speed | 1 mm/s to 1 m/s |
| Operating Frequency | 120 mechanical / 30 electrical operations per min |
| Conduit Entry | PG13.5 (G1/2 compatible) |
Resources & Downloads
FAQ for WLCA12-TH-N
What does the TH suffix mean on the WLCA12?
The TH suffix marks the heat-resistant version of the WLCA12, rated to +120 °C ambient versus +80 °C on the standard WLCA12-N. It is the right pick near ovens, steam lines, and curing cabinets. For most general-purpose panels at normal ambient, the WLCA12-N is the more cost-effective choice.
What is the difference between WLCA12-TH-N and WLCA12-LD-N?
Both are 2-circuit WL-N switches with adjustable roller levers and an operation indicator. The TH-N has a neon lamp and a heat-resistant body (+120 °C); the LD-N has an LED lamp and the standard +80 °C body. Pick TH-N near heat; pick LD-N for normal ambient and lower-power LED status.
Can the WLCA12-TH-N switch small DC control signals?
Yes, but watch the electrical life rating. At 10 A 250 VAC the WLCA12-TH-N is rated for 750,000 operations; at low-current DC (a few mA into a PLC input) the rating is lower because of the inductive nature of the contact. For pure low-signal use, consider a D4N snap-action switch with a gold-plated contact.
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