DIN Rail Pakistan 2026: TH35 vs TS32 Standard
DIN Rail Pakistan 2026 — TH35 vs TS32 Standard, Mounting & Price Guide
Last verified: 2026-05-29 · Author: CNC Electric Pakistan Engineering Team · Reading time: 5 min
The DIN rail (DIN 50022 / EN 50022) is the metal strip inside every Pakistani distribution board that holds MCBs, RCCBs, contactors, terminal blocks, and SPDs in place. Using the wrong DIN rail width — or the wrong material — is the #1 cause of board components vibrating loose, falling off, or not seating properly. This guide tells you exactly which DIN rail to specify.
Quick Answer — 3 DIN Rail Standards
| Standard | Width × Depth | Use | Price (PKR / m) |
|---|---|---|---|
| TH35-7.5 (most common) | 35mm × 7.5mm | 99% of MCBs, RCCBs, contactors | Rs. 280 – 480 / m |
| TH35-15 (heavy duty) | 35mm × 15mm | Larger MCCBs, heavy contactors > 65A | Rs. 580 – 950 / m |
| TS32 (mini-rail) | 32mm × 7.5mm | Older European switchgear, niche | Rs. 380 – 620 / m |
| G-rail 32mm | 32mm G-shape | Legacy industrial relay racks (uncommon in PK) | Rs. 480 – 780 / m |
TL;DR: For 99% of Pakistani applications use TH35-7.5 (35mm × 7.5mm top-hat). All standard MCBs, RCCBs, RCBOs, terminal blocks, contactors up to 65A, SPDs, timers, and PLCs use this profile.
Material Choice — Steel vs Aluminium
- Cold-rolled steel zinc-plated (most common, default): cheaper, stronger, magnetic. Standard for residential / commercial DB. CNC default offering.
- Aluminium: lighter (40% of steel weight), non-magnetic (important for sensitive electronic instruments), corrosion-resistant for humid Karachi coastal sites. 25-40% more expensive.
- Stainless steel 304: for marine, chemical plant, food-processing facilities where corrosion is constant. 3-4× the price; rarely needed in Pakistan.
Length Standards
| Length | Typical Use | Modules Held (18mm) |
|---|---|---|
| 125mm | Mini junction box | 6 modules |
| 250mm | Small enclosure / 8-way DB | 12 modules |
| 500mm | 12-18 way DB | 24 modules |
| 1000mm | Standard panel-build stock length | 52 modules |
| 2000mm | Bulk for panel builders, cut to size | 110 modules |
For panel-build shops in Pakistan, buy by the 2-metre length and cut with a metal saw or angle-grinder cutting disc on site. Deburr the cut end with a file to avoid hand injuries during MCB clip-on.
Mounting Hole Spacing
Standard DIN rail comes pre-punched with mounting slots at 25mm spacing for M5 screws. Always use at least 3 mounting screws per metre of rail (start, middle, end). Heavy loads (MCCB, large contactor) need 4-5 screws per metre to prevent flexing.
Common Pakistani Wiring-Board Errors
- Using TS32 instead of TH35: MCBs designed for 35mm rail won't clip properly on 32mm — they fall off under vibration. Always check the rail spec on the back of new MCBs.
- Mounting on plain steel sheet without rail: some Pakistani panel builders skip the rail and screw MCBs directly. This bypasses the snap-mount, voids warranty, and creates a fire risk if the MCB shifts during a short-circuit event.
- Mixing 7.5mm and 15mm depth: 15mm-depth rail won't fit standard 35mm enclosure depth budget. Plan ahead.
- Reusing rusted rail: salvaged rail from old panels often has thread-stripped slots. Buy new — Rs. 280/m is too cheap to skimp on.
FAQs
What is the price of DIN rail in Pakistan?
CNC DIN rail Pakistan: TH35-7.5 steel zinc-plated Rs. 280-480 per metre; TH35-15 heavy-duty Rs. 580-950/m; aluminium Rs. 480-720/m; stainless Rs. 1,200-1,800/m. Cut lengths 125/250/500/1000/2000mm. Bulk panel-builder pricing on 50+ metres.
What size DIN rail do MCBs use?
Standard MCBs, RCCBs, RCBOs, terminal blocks, contactors up to 65A, SPDs, timers all use TH35-7.5 (35mm wide, 7.5mm deep) per IEC 60715. This is the universal Pakistani standard.
Can I use TS32 rail for MCBs?
No. TS32 rail is 32mm wide vs the 35mm width that standard MCBs are designed to clip onto. MCBs forced onto TS32 will not snap securely and may fall off under vibration. Always use TH35.
Steel or aluminium DIN rail?
Steel for 95% of installations — cheaper, stronger, magnetic. Aluminium for humid coastal Karachi sites (corrosion resistance) or non-magnetic requirements (instrument racks). Stainless only for marine/chemical/food-processing.
How do I cut DIN rail to length?
Use a hacksaw, angle grinder with cutting disc, or DIN-rail-specific shear. Deburr the cut end with a file. Drill new M5 mounting hole 25mm from the cut end if you cut between existing mounting slots.
Related CNC Categories
- Circuit Breakers — all MCB / MCCB / RCCB use TH35 rail
- Terminal Blocks — DIN-rail mount range
- Magnetic Contactors — DIN-rail snap-mount
- Timer Relays — DIN-rail mount
- Terminal Block Pakistan — DIN Rail Spring/Screw