Overview
The TDK-2513 and TDK-2514 are two small cab switches used on the dashboard and cab panel of commercial vehicles, construction machinery and new-energy platforms. Both run on a 24 V system and hold a −40 to +85 °C working range. The TDK-2513 is a self-reset (momentary) button — you press it, it signals the vehicle, and it springs back; the TDK-2514’s switching action is confirmed per programme. They are presented together as cab discrete-switch line items, but they are two distinct parts with different sealing, endurance and connectors.
The TDK-2513 is the round, red-backlit button with a printed graphic on the cap. The TDK-2514 is the compact threaded-body pre-ignition switch that mounts through the panel on a flying lead. Choose by the job: a lit dashboard button versus a sealed threaded switch on a compact panel-through body.
TDK-2513 — illuminated round self-reset button
The TDK-2513 is a round push button with a red backlight that is steady-on whenever the button is powered, so the control is easy to find at night. It is a self-reset (momentary) button: it closes while pressed and springs back on release, reporting a press to the vehicle rather than latching. The press is defined — a 6 ± 2 N key force over a travel of more than 2.5 mm — and it is rated for a long service life of over 1,000,000 operations. It switches up to a 500 mA load, is sealed to IP5K2, and carries the RoHS and UL94-HB flammability ratings. Youlai lists it for new-energy vehicles, commercial vehicles and construction / engineering machinery.
TDK-2514 — threaded pre-ignition switch
The TDK-2514 “pre-ignition switch” is a compact threaded-body switch on a flying lead. It runs on 18–32 VDC (24 V rated), is sealed to IP57, and is rated for 30,000 operations. It is built to an insulation standard — under a 550 V, 50 Hz sinusoidal test the insulation between conductive parts does not break down and the insulation resistance stays ≥ 10 MΩ — and meets UL94 flammability (burn rate ≤ 100 mm/min) and the Chinese automotive banned-substance standard GB/T 30512-2014 (China ELV / RoHS-equivalent). The cap is a black, fine-matte-textured plastic. Its two leads are brought out on a Molex 43645-0300 connector (pinout below); its switching action is confirmed per programme.
The two models compared
Both are 24 V cab switches, but they are specified differently:
| Specification | TDK-2513 (round self-reset button) | TDK-2514 (pre-ignition switch) |
|---|---|---|
| Form | Round illuminated panel button | Threaded-body switch on flying lead |
| Operating voltage | DC 24 V (9–36 V) | 18–32 V (rated 24 V) |
| Action | Self-reset (momentary) | Confirmed per programme |
| Load / signal | 500 mA load | Contact rating per programme (0.5 mm² leads) |
| Key force | 6 ± 2 N | Not specified |
| Travel | > 2.5 mm | Not specified |
| Endurance | > 1,000,000 operations | 30,000 operations |
| Illumination | Red backlight, steady-on when powered | None |
| Storage temperature | −40 to +85 °C | −40 to +90 °C |
| Protection grade | IP5K2 (ISO 20653) | IP57 (IEC 60529) |
| Insulation | Not specified | ≥ 10 MΩ; withstands 550 V / 50 Hz |
| Flammability | UL94-HB | UL94 (≤ 100 mm/min); GB/T 30512-2014 |
| Connector | TE 929504-1 | Molex 43645-0300 (3-way) |
In short: the TDK-2513 is the lit dashboard button you specify when the driver needs a visible, high-cycle control; the TDK-2514 is the sealed threaded switch you specify when a single pre-ignition input must be brought out on a compact panel-through body rated for temporary immersion.
Connector & wiring
The TDK-2513 wires through a 4-way connector — the harness-side mating half is a TE 929504-1 (switch side TE 929505-1) — carrying its switch signal, the signal common and the two backlight lines. The published pin assignment is below.
| Pin | Function | Note |
|---|---|---|
| 1 | Switch output | Logic-level signal |
| 2 | Switch input / common | Signal ground |
| 3 | Backlight + | Position-lamp power |
| 4 | Backlight − | Ground |
The TDK-2514 brings its two leads out on a Molex 43645-0300 3-way connector — a red and a black 0.5 mm² lead land on base terminals A and B, and the third position (C) is unused and capped with Ø4 heat-shrink. The source drawing shows terminals A and B bridged by a 30 mm link on the switch base, so treat A and B as one switched pair rather than two independent terminals; the exact make/break behaviour and final assignment are confirmed at RFQ.
| Pos | Lead | Function |
|---|---|---|
| 1 | 0.5 mm² red | To base terminal A |
| 2 | 0.5 mm² black | To base terminal B |
| 3 | — | Position C — unused, Ø4 heat-shrink capped |
The TDK-2513 switches up to a 500 mA load, which suits a controller or lamp input rather than a starter or relay coil directly — for a higher load, tell us the current and we confirm the part rating or propose a relay-driven arrangement. The TDK-2514’s make/break behaviour and contact rating are confirmed per programme against the current drawing.
Sealing, feel & durability
Because a cab switch is pressed on almost every trip, both parts are specified for service life and environment. The TDK-2513 is rated for > 1,000,000 operations with a defined 6 ± 2 N press and > 2.5 mm travel, sealed to IP5K2 under the road-vehicle standard ISO 20653 — dust-protected, with the water class covering dripping water at up to 15° from vertical. The TDK-2514 is rated for 30,000 operations and sealed to IP57, which is an IEC 60529 code: dust-protected, and rated for temporary immersion, matched to a more exposed threaded-through mounting. The two codes come from different standards and are not two points on one scale, so read each against the position it is going into rather than against the other. Both hold a −40 to +85 °C working range and are flame-rated to UL94.
Mounting & dimensions
The TDK-2513 is a round panel button — the button body is about Ø21.4 mm, the front bezel about Ø28.7 mm and the overall height about 39.2 mm. Its mounting drawing calls for a keyed Ø26 mm panel opening (with anti-rotation notches, about Ø30 mm across the key tab) dimensioned for a 3 mm panel; confirm the exact cutout against the current drawing. The TDK-2514 is a threaded-body part: overall length about 58.7 mm, body diameter Ø17.9 mm, a square 18.3 × 18.3 mm flange with Ø3 mm corner holes, internal threads to 5/8-24 and 9/16-24 UNEF-2A, and a 100 ± 10 mm flying lead. The TDK-2514 socket is fixed to the instrument panel with four pan-head self-tapping screws at a recommended tightening torque of 30 N·cm.
Where they fit
Both parts belong to the Switches & Sensors family of cab discrete controls. They sit alongside the other dashboard switches — for the driver’s start control see the TDK-902 / 905 engine start-stop button; for grouped lighting and instrument control see the EDK-2006 light & instrument switch; for a rugged exposed-panel selector see the JDK-2201 sealed 3-position toggle; and where the dashboard needs a dedicated hazard control with its own lit triangle rather than a general-purpose lit button, that is the TDK-901 hazard warning switch. Each is an operator input; the vehicle’s controllers act on the signal. For how a hard-wired signal button like the TDK-2513 compares with LIN and CAN switches when you scope a dashboard, see the CAN vs LIN vs hard-wired switches guide.
Manufacturing & testing
Built under IATF 16949 with APQP project planning and a PPAP package available for OEM programmes. End-of-line testing follows the programme’s control plan — typically switch continuity, actuation and, on the TDK-2513, illumination — while endurance, temperature soak, sealing and the TDK-2514 insulation withstand are validated on a sample basis in our in-house lab when a programme calls for fresh qualification.
Common questions from buyers
What is the difference between the TDK-2513 and the TDK-2514? The TDK-2513 is an illuminated round self-reset button (red backlight, 500 mA, IP5K2, > 1,000,000 cycles, 4-way TE 929504-1 connector). The TDK-2514 is a threaded-body pre-ignition switch on a flying lead (no backlight, IP57, 30,000 cycles, 550 V insulation withstand, Molex 43645-0300). Both are 24 V cab switches rated −40 to +85 °C.
Are they latching or momentary? The TDK-2513 is a self-reset (momentary) button — it closes while pressed and springs back on release, reporting an input rather than holding a state. The TDK-2514’s switching action (momentary vs maintained) is confirmed against the current drawing per programme.
Can they switch a lamp or relay directly? The TDK-2513 is rated to a 500 mA load on its 4-way connector; the TDK-2514’s contact rating is confirmed per programme. For a higher load, tell us the current and we confirm what the part can carry or propose a relay-driven arrangement.
What connector and mating part do I need? The TDK-2513 uses a 4-way connector (harness-side mating half TE 929504-1, switch side TE 929505-1; pinout above); the TDK-2514 uses a Molex 43645-0300 3-way (pinout above). Send your harness plan and we confirm the final assignment.
Can the graphic, backlight colour or panel be changed? The cap graphic and, on the TDK-2513, the backlight are defined per programme. Send the artwork and panel drawing with your RFQ.
How to ask
The TDK-2513 / TDK-2514 belong to the Switches & Sensors family. Tell us which switch you need (illuminated button or threaded pre-ignition switch), the target vehicle programme, the system voltage, the function each switch reports, and expected annual volume — and we will confirm the connector pinout, the cap graphic and the sealing level. Use the contact page; drawings welcome.
