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Views: 0 Author: Site Editor Publish Time: 2025-09-26 Origin: Site
A key lock switch — officially a key switch lock — is built from five core parts: a lock cylinder at the front, the key, a cam or switching mechanism, electrical contacts with terminal pins at the rear, and a housing that mounts in the panel. Turning the correct key moves the contacts and switches the circuit.
This article explains each part, how the parts work together, and what a buyer should specify. It is written by Jin Tay, which has manufactured key switch locks in Taiwan since 1980 and was the first manufacturer in Taiwan to develop the 12mm key switch lock.
A key lock switch has five main parts:
1. Lock cylinder — accepts only the matching key.
2. Key — the credential that authorizes operation.
3. Cam or switching mechanism — converts key rotation into switching movement.
4. Electrical contacts and terminal pins — open or close the connected circuit.
5. Housing and mounting hardware — protect the mechanism and fix it to the panel.
Part | Position | Function | What the buyer specifies |
Lock cylinder | Front | Blocks rotation without the correct key | Key profile, key code program |
Key | Front | Physical authentication | Keyed alike or keyed different; withdrawal positions |
Cam or switching mechanism | Middle | Turns key rotation into contact movement | Number and sequence of positions; maintained or momentary |
Contacts and terminal pins | Rear | Switch one or two circuits | Terminal count and style; wire soldering |
Housing and mounting | Around | Protects parts, mounts in panel | Outer diameter, material, environmental rating |
The lock cylinder is the security element. Without the correct key it cannot rotate, so nothing behind it can move. Jin Tay offers key switch locks with flat-key and tubular-key cylinders, and multiple switching configurations, key entry orientations, and key profile options are available.
The key provides physical authentication, ensuring that only authorized personnel can operate equipment or electrical circuits. The buyer also decides where the key can be withdrawn: in one position only, so the equipment is always left in a known state, or in several positions.
Cam or Switching Mechanism — Translates key rotation into controlled mechanical movement or electrical contact engagement. A detent holds the key at each position so the operator feels the switch engage. In a momentary position the mechanism is spring-loaded: the contact is made only while the key is held, and the key returns by itself when released.
Avoid Excessive Torque — Do not over-rotate the key. Excessive torque may damage the key and the internal detent mechanism.
Behind the mechanism, contacts connect to terminal pins that are wired to the equipment. Jin Tay key switch locks carry up to 8 terminal pins and support single- or dual-circuit switching. Most designs use 2 or 3 key positions — for example OFF/ON, or OFF/ON/ON — and special designs reach 8 positions. Wires can be soldered to the terminals in production so the part arrives ready for assembly. Position options are explained in how many positions a key switch lock has.
The housing encloses the mechanism and passes through a round hole in the equipment panel. Standard outer diameters are 12mm, 16mm and 19mm. Most housings and cylinders are zinc alloy; brass and, on specific models, plastic are also used. Key switch locks are designed to resist vibration, dust and static, and water resistance depends on the model: for example, the S2985 is rated IP65 and the S2015 is rated IPX5, both under IEC/EN 60529. Jin Tay states IP ratings per model, not per series.
1. The key is inserted. The cylinder recognizes the matching key and is free to rotate.
2. The key is turned. The cam or switching mechanism moves with it and stops at the next detent.
3. The contacts change state. The terminal pins open or close the connected circuit.
4. The key is held, left or withdrawn. In a maintained position the circuit stays as set; in a momentary position it returns when the key is released; where withdrawal is allowed, the key can be removed.
A fuller walk-through is in how key switches work.
It is both. A key lock switch is a mechanical lock at the front joined to an electrical contact set at the rear, and every key switch lock combines the two in one component. The lock decides who may operate the equipment, and the electrical contacts decide what the circuit does when the key turns. This is why a key lock switch is specified by both its lock features, such as the key profile and the key withdrawal positions, and its electrical features, such as the number of terminal pins and the switching configuration.
Key switch lock | Cam lock | |
Rear structure | Terminal pins | Cam plate |
What it does | Switches an electrical circuit | Latches a door or drawer |
Parts | Not interchangeable with cam lock parts | Not interchangeable with key switch lock parts |
The two can look alike from the front, because both mount through a round panel hole. They are different products.
• Outer diameter: 12mm, 16mm or 19mm
• Number of positions and their sequence; maintained or momentary action
• Key withdrawal position or positions
• Number and style of terminal pins; wire soldering if required
• Operating environment, so that a model with the right IP rating is chosen
• Key program: keyed alike or keyed different
• Certification needs. For UL-certified electrical safety verification (US and Canada), Jin Tay's Key Switch Lock series offers UL-certified options.
Electrical ratings are confirmed model by model on the product specification sheet. The key switch lock buyer's guide covers the selection in more depth, and what a key lock switch is covers the terminology.
A key lock switch has five main parts: the lock cylinder, the key, the cam or switching mechanism, the electrical contacts with their terminal pins, and the housing with its mounting hardware. The cylinder and key sit at the front and decide who may operate the switch. The mechanism in the middle converts key rotation into movement, and the contacts at the rear open or close the circuit. Jin Tay builds these parts into key switch locks with 12mm, 16mm and 19mm outer diameters.
The cam or switching mechanism translates key rotation into controlled mechanical movement or electrical contact engagement. As the key turns, the mechanism moves the contacts from one state to the next and a detent holds each position. In a momentary position the mechanism is spring-loaded, so the contact is made only while the key is held. To protect it, avoid excessive torque: do not over-rotate the key, because excessive torque may damage the key and the internal detent mechanism of the lock.
Jin Tay key switch locks carry up to 8 terminal pins at the rear, which allows single- or dual-circuit switching from one key. The number needed depends on how many circuits the key must control and on the switching sequence. Most designs use 2 or 3 key positions, and special designs reach 8 positions. Terminal style is chosen to suit the wiring method, and Jin Tay can solder wires to the terminals in production so that the part arrives ready for assembly.
In a maintained position the key stays where it is turned and the circuit keeps its state until the key is turned again. In a momentary position a spring returns the key as soon as it is released, so the circuit is switched only while the key is held. A familiar example is a storage compartment release: the key is turned, the compartment opens, and the key returns by itself. Many key switch locks combine maintained and momentary positions in one switching sequence.
For UL-certified electrical safety verification (US and Canada), Jin Tay's Key Switch Lock series offers UL-certified options. Buyers who need it should say so at the inquiry stage and confirm coverage for the chosen configuration on the specification sheet supplied with the quotation. Jin Tay operates under ISO 9001 quality management, and its products comply with the EU RoHS directive. Ingress protection is stated per model, under the IEC/EN 60529 standard: for example, the S305 is rated IP65 and the S2983 is rated IP54.
Key lock switches are used for equipment power control wherever operation should be limited to key holders. Typical applications are mobility scooters, golf carts and forklifts, servers and industrial control boxes, vending machines, lawn mowers and alarm systems. In each case the key provides physical authentication, ensuring that only authorized personnel can operate equipment or electrical circuits. The switching sequence, the terminal count and the key withdrawal positions are then specified to match what the equipment has to do in service.
Jin Tay offers OEM/ODM services with over 45 years of lock manufacturing expertise. Contact our team for samples, specifications, or a custom quote.
