Omron WLCA12-2N-N — Limit Switch, Adj. Roller Lever, DPDT
SKU: WLCA12-2N-NUSD 15.00
Two-circuit limit switch with adjustable roller lever (25 to 89 mm length), 90° overtravel, DPDT (2 Form C / SPDT × 2) contact, 10 A at 250 VAC, IP67. Head mounts in any of 4 directions. -N = standard sensitivity, standard load.
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Product Overview
The WLCA12-2N-N is the adjustable-roller-lever variant of Omron's WL-series two-circuit limit switch family — the workhorse position-feedback switch for industrial machinery, conveyor systems, and material-handling equipment. The lever length is adjustable from 25 to 89 mm via an Allen-head bolt on the lever hub, allowing the same SKU to be used across multiple actuator positions in a machine design without stocking different lever-length SKUs. The roller (R38 stainless steel standard, with R50 and R63 options) rolls smoothly across the cam or dog without friction, giving the 10-million-operation mechanical life even at high-cycle applications.
Where the WLCA12-2N-N sits in the WL family
The WL family is organized along four axes: sensitivity (WLC = standard, WLG = high sensitivity, WLH = low temperature / high temp), actuator type (WLCA = standard body, WLCL = adjustable rod lever, WL01 = horizontal-mount), overtravel (no suffix = 25° standard overtravel, -2 = 90° high overtravel), and circuit configuration (no suffix = SPDT / Form C, -2 = DPDT / two-circuit / 2 × SPDT, -N = standard load 10 A, -LD = low-current load 0.1 A). The WLCA12-2N-N (this SKU) sits at the standard-sensitivity / adjustable-roller-lever / 90°-overtravel / two-circuit / standard-load intersection.
Adjustable roller lever setup, lever length, and roller options
The adjustable roller lever is the key feature for OEM machine builders — one SKU covers multiple cam positions across the machine. Adjustment procedure: (1) loosen the Allen-head bolt on the lever hub with a 4 mm hex key; (2) slide the lever to the desired length (25 to 89 mm range from the hub center to the roller center); (3) re-tighten the Allen-head bolt to 2.5 N·m torque.
Two-circuit DPDT configuration and wiring
The WLCA12-2N-N is a two-circuit / DPDT switch — it has two independent SPDT (Form C) contact sets, each with a common (COM), normally-open (NO), and normally-closed (NC) terminal. This gives you 4 user-accessible terminals per switch (plus the ground terminal): COM1, NO1, NC1, COM2, NO2, NC2. Wire one circuit as the position-feedback signal to the PLC (typically NO + COM) and the other circuit as a hardwired interlock or indicator (typically NC + COM for 'actuator not engaged' signal).
Key Features
- Two-circuit / DPDT limit switch
- Adjustable roller lever
- Standard roller R38 stainless steel
- 90° overtravel — high-overtravel variant for cam-departure applications
- Standard sensitivity
- 10 A at 250 VAC standard load rating
- Mechanical life: 10 million operations minimum
- Electrical life: 200,000 operations at 250 VAC 10 A resistive load
- SKU: WLCA12-2N-N
- Series: WL-N / WLM-N Two-circuit Limit Switches
Best-Fit Applications
- Cam-actuated conveyor transfer position feedback — WLCA12-2N-N mounted on the conveyor frame, R38 roller riding on the cam plate; 90°.
- Pneumatic cylinder end-of-stroke detection — WLCA12-2N-N mounted on the cylinder body, cam dog on the rod end; adjustable roller lever.
- Safety door interlock — WLCA12-2N-N on the machine guard frame with WLRCA12 fork-lever-lock operation key on the door; wire both.
- Indexing table position confirmation — WLCA12-2N-N at each station on the rotary indexing table, R50 oversized roller rides on the.
Buying Checklist
- Pick WLCA12-2N-N for adjustable roller lever with 90° overtravel and DPDT two-circuit contacts
- Pick WLCA12-N for single-circuit version — pick if you only need one circuit and want lower cost
- Pick WLGA12-2N-N for high-sensitivity version — pick for low-force cam applications or precise positioning
- Pick WLCA12-2LD-N for low-current gold-contact version — pick for direct PLC input signaling
- Pick WLCA12-2N-G for G1/2 conduit entry — pick if your cabinet uses G1/2 conduit
- Pick WLRCA12-2N-N for fork-lever-lock variant — pick if the cam has sharp edges that would slip off a roller lever
Technical Specifications
| Model | WLCA12-2N-N |
|---|---|
| Series | WL-N / WLM-N Two-circuit Limit Switches |
| Type | Adjustable roller lever, two-circuit DPDT |
| Operating Mechanism | Snap-action (single-pole double-throw per circuit, two circuits total) |
| Pretravel | 15° max (standard sensitivity; WLG high-sensitivity = 10° max) |
| Overtravel | 90° min (the -2N suffix; standard = 25°) |
| Movement Differential | 10° max |
| Operating Force | 0.39 N·m max (5.88 N max linear at lever end) |
| Roller Lever Adjustment Range | 25 to 89 mm (lever length from hub center to roller center) |
| Head Mounting Direction | 4 directions (90° increments, M4 Allen-bolt lock) |
| Ambient Operating Temperature | -10 to +80 °C (no icing) |
| Mounting Holes | 2 × M5 bolt holes on 35 × 60 mm pattern (centered on body) |
| Certifications | UL listed (E76659), CSA, TÜV, CCC, CE |
Resources & Downloads
FAQ for WLCA12-2N-N
What's the difference between WLCA12-2N-N and WLCA12-N?
Both are adjustable-roller-lever WLCA12-series limit switches with the same 25-89 mm lever adjustment, same R38 roller, same 10 A load rating. The WLCA12-2N-N (this SKU) is the two-circuit / DPDT variant — it has two independent SPDT contact sets, allowing two simultaneous signals (e.g. one to PLC, one to indicator; or two in series for safety interlock). The WLCA12-N is the single-circuit / SPDT variant — only one contact set, allowing one signal.
Is the WLCA12-2N-N suitable for safety interlock applications?
The WLCA12-2N-N is NOT formally safety-rated — it does not have TÜV SÜD or BG certification for Cat 3/PL d or Cat 4/PL e applications. For low-risk safety interlocks (Cat 1 / PL c, single-channel) you can use the WLCA12-2N-N by wiring both NC circuits in series and monitoring both with a safety relay (G9SE-201 / G9SB-200-B) — this provides single-fault tolerance but not full Cat 3/PL d.
How do I adjust the roller lever length?
Loosen the M4 Allen-head bolt on the lever hub (located where the lever meets the switch head) with a 4 mm hex key. The lever can now slide axially in the hub. Slide to the desired length, measured from the hub center to the roller center — the adjustment range is 25 to 89 mm. Re-tighten the Allen-head bolt to 2.5 N·m torque (do not over-tighten, the bolt is steel but the hub is aluminum and the threads can strip).
Can the WLCA12-2N-N switch DC loads?
Yes — the WLCA12-2N-N is rated for DC loads up to 10 A at 30 VDC (10 A at 250 VAC, 6 A at 250 VAC inductive). The contact material is silver alloy which is suitable for both AC and DC loads. For higher DC voltages (> 30 VDC) the contact arcing becomes more severe and reduces electrical life — at 100 VDC the electrical life drops to ~50,000 operations; at 200 VDC to ~20,000 operations.
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