# DIN rail circuit breaker (MCB) dimensions, DIN 43880: 17.5 mm per pole, 18 mm module pitch, heights and depths by size

> What are the dimensions of a DIN rail miniature circuit breaker (MCB): width per pole, height, depth and the DIN 43880 module sizes?

- Category: Electronics › Wiring & connectors
- Kind: Standard part
- Basis: DIN 43880 figures as quoted by Phoenix Contact (the standard is paywalled), with ABB, Hager, Rittal, Schroff and Soyter data for real devices; numbers only
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**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- DIN 43880 ('Reiheneinbaugeräte', built-in equipment) fixes the envelope that circuit breakers (MCBs), RCDs, switches, sockets and meters share on a 35 mm DIN rail: a module pitch of 18 mm with devices 17.5 mm wide (+0.5 / −0), so one-pole MCBs are one module, two-pole two, and so on. Distribution boards are specified in rows of modules ('4 × 12 TE' = four rows of 12). The standard text is paywalled; the figures below are what Phoenix Contact's housing guide quotes from it, plus maker data sheets.
- Heights and depths are given per installation size (1, 2, 3): h2 / h3 max 45 / 55 / 75 mm and t2 max 55 / 70 / 92.5 mm as Phoenix prints them. How those two tables map to a real breaker is not spelled out in the sources: ABB labels an S201 as 'DIN 43880 installation size 1' with a 69 mm depth, which is above the quoted size-1 depth, so the size labels evidently apply to the height and depth classes separately. Check the standard if you rely on a size.
- Real breaker sizes vary by maker: ABB S201 88 mm tall, Hager NBN 83 mm; both 17.5 mm per pole and 69 or 70 mm deep. Pole widths for 2, 3, 4 poles are n × 17.5 (35 / 52.5 / 70); Soyter's enclosure table lists 35, 52 and 70 mm, Schroff's 3 × 16 A module is 53.5 mm.
- DIN 43880 describes the envelope, not the DIN rail itself: the rail is TS35 × 7.5 or × 15 (IEC / EN 60715), on the DIN rail page. The 45 mm window and the front cut-out of a cover are not given as numbers in any source read, so no cut-out file is drawn.
- Not covered: breaker curves, poles' internal geometry, busbar combs, 63 A and DIN 43880 size-3 devices' real dimensions (only the standard's limits above).

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| module width | 17.5 mm per pole on an 18 mm pitch (+0.5 / −0 device width) | enclosure or panel slot sized on the 18 mm pitch per module | designed | all |
| DIN rail | TH35-7.5 or TH35-15 (IEC 60715) | 35 mm top-hat rail on din-rail-35mm | designed | all |

## Sizes

| item | mm | source and note |
|---|---|---|
| module pitch (1 TE, 'division unit') | 18 | Phoenix Contact quoting DIN 43880 (also Rittal: 'à 18 mm') |
| module width, actual device | 17.5 (+0.5 / −0) | Phoenix Contact quoting DIN 43880; ProZ quotes the standard's text 'Teilungseinheit = 17,5 mm' |
| 1-pole MCB width | 17.5 | ABB S201P-C1 and Hager NBN150A (1 module) |
| 1-pole breaker width, Schroff module | 17.7 | Schroff 1 × 16 A (3 × 16 A: 53.5) |
| 2 / 3 / 4 modules wide (enclosure lengths) | 35 / 52 / 70 | Soyter enclosures (listed values; 17.5 × n) |
| minimum clearance between neighbouring devices | 18 | Phoenix Contact (DIN 43880) |
| device slot, 12 modules | 216 × 46 | Phoenix Contact: 216 mm (12 × 18) × 46 mm |
| height h2 / h3 max, size 1 / 2 / 3 | 45 / 55 / 75 | Phoenix Contact, DIN 43880 table 1 |
| depth t2 max, size 1 / 2 / 3 | 55 / 70 / 92.5 | Phoenix Contact, DIN 43880 table 2 |
| t4 minimum | 52 | Phoenix Contact |
| distance rail upper edge to protection cover lower edge | 44 (required) | Phoenix Contact (Fig. 13 / 14) |
| maximum t for housing parts in the area reachable by non-qualified persons | 70 | Phoenix Contact |
| row spacing on a distribution board | 150 (+ 25 mm steps for large cables) | ProZ quoting the German text |
| real 1-pole MCB, ABB S201P-C1: width × height × depth | 17.5 × 88 × 69 | ABB; labelled net width / height / depth; 'installation size 1'; rail TH35-7.5 or TH35-15 |
| real 1-pole MCB, Hager NBN150A: width × height × depth | 17.5 × 83 × 70 | Hager |

## Where the files are

- Phoenix Contact: [Technical principles of electronics housings for DIN rail: DIN 43880 section: module pitch 18 mm, device width 17.5 +0.5 -0, heights and depths by size, device slot](https://dam-mdc.phoenixcontact.com/asset/156443151564/dfa8378cd4361e3a695bd1be65bd338a/1082999_EN_HQ_HOUSING_Basics_LoRes.pdf) — web — Publisher's page; dimensions are facts
- ProZ (quoting the standard's German text): ['Die Norm legt eine Teilungseinheit (TE, auch Modul genannt) = 17,5 mm fest'; row spacing 150 mm](https://mlt.proz.com/kudoz/german-to-polish/computers-systems-networks/4355347-teilungseinheit.html) — web — Publisher's page; dimensions are facts
- ABB (manualmachine copy): [S201P-C1 technical data: width 17.5, height 88, depth 69, TH35-7.5 and TH35-15 rail, 'acc. to DIN 43880 1 installation size'](https://manualmachine.com/abb/s201pc1/7630340-technical-data) — web — Publisher's page; dimensions are facts
- Hager: [NBN150A MCB 1P: width 17.5 (1 module), height 83, depth 70](https://hager.com/intl-en/products/information/nbn150a-mcb-1p-10ka-15ka-b-50a-1m) — web — Publisher's page; dimensions are facts
- Rittal: [DK 7480.035 mounting rail: DIN 43880 installation devices sizes 1 to 3, 'max. Teilungseinheiten a 18 mm' 22](https://www.rittal.com/pdf-creator/variant/at-de/7480035) — web — Publisher's page; dimensions are facts
- Schroff (Mercateo copy): [Power distribution modules to DIN 43880: widths 17.7 (1 x 16 A breaker), 53.5 (3 x 16 A), 46, 44 mm](https://static.mercateo.com/cd/6996b3ad28464d939bc17e037ed63c99/pdf/schroff-3_34_eng.pdf) — web — Publisher's page; dimensions are facts
- Soyter: [Modular DIN rail enclosure to DIN 43880: module 17.50 mm (standard 18), enclosure lengths 35 / 52 / 70 / 105 / 157 / 210 / 260 for 2 / 3 / 4 / 6 / 9 / 12 / 15 modules](https://soyter.pl/en/menu/modular-din-rail-enclosure-in-accordance-with-din-43880-832.html) — web — Publisher's page; dimensions are facts
- DIN Media: [DIN 43880 Installation equipment: built-in dimensions (standard, paywalled; the title only)](https://dinmedia.de/en/standard/din-43880/1406097) — web — Publisher's page; dimensions are facts

## Questions

**How wide is a one-pole MCB?**

17.5 mm (one module); the DIN 43880 module pitch is 18 mm. A 2-pole is 35 mm, 3-pole 52.5 mm and 4-pole 70 mm.

**How tall and deep is a DIN rail breaker?**

ABB S201: 88 × 69 mm; Hager NBN: 83 × 70 mm (height × depth). DIN 43880 limits the depth to 55 / 70 / 92.5 mm by size.

**What rail do MCBs sit on?**

A 35 mm top-hat rail, 7.5 mm (TH35-7.5) or 15 mm deep (TH35-15), IEC 60715.

**Is a module 17.5 or 18 mm?**

Both: the pitch is 18 mm, the device width is 17.5 mm (+0.5 / −0), so devices have a small gap.

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