DIN energy meters: MID, 1-phase/3-phase, direct connection and CTs

Guides 19/10/2026 By INVENTĀRS 11 views 0 reviews

A DIN energy meter in the board shows how many kWh a circuit or a tenant takes. It is not the DSO billing meter at the incomer and not an LBN 53.4 acceptance test — see acceptance tests. This page is how to read the card: phases, current, MID, S0, CT.

LBN 261-15 does not specify a meter model. P.8³: dwellings with incomer protection above 32 A are three-phase. No live CT wiring steps.

Field	Meaning	Mistake
1 ph. / 1P+N	Single-phase circuit	Using it on a three-phase site “because 40 A is enough”
3 ph. / 3P / 3P+N	Three phases; N only if the card says so	One 1-phase meter on one phase “to see the house”
40 A … 125 A	Direct-connection rating	Feeding 80 A into a 5 A meter “on the terminals”
5 A / 6 A + CT	Measurement via current transformers	Treating 5 A as the building’s 80 A
MID	MID marking on the card (measuring instrument for commercial metrology in the EU frame)	Assuming every DIN meter is MID
S0	Pulse output to another system	S0 = “Wi-Fi included”

Our recommendation: if kWh is used between parties for settlement, take a meter that has MID on the card. For workshop monitoring only, MID is not mandatory — then it is not a billing argument.

MID on the card: Finder 7M.24 17.5 mm, 1-phase, LCD, 40 A, 230 V AC, S0, MID. Finder 7M.38 3-phase, 80 A, 3×230/400 V AC, 2×S0+IR+NFC, MID. THORGEON 01005 1-phase 50 A MID. THORGEON 01006 3-phase 80 A MID.

MID not written on this extract: Schneider iEM3100 63 A, 1P+N, IP40 (series text mentions sub-billing — we do not claim MID). iEM3310 125 A, 3P. ABB OD1065 1-phase, no A and no MID on the card. THORGEON 01001 1-phase 40 A, no MID word. iEM3210 3P 5 A is a CT rating. THORGEON 01004 3-phase CT 6 A. CT ratio is a design input — we do not invent 100/5.

Count modules in the BOM and DIN accessories. 17.5 mm ≠ “every meter is 1 module”. Digital meters. Boards and DIN gear.

Sources: LBN 261-15 p.8³, 53.4, 55 (18.10.2026); MID/A/phases/S0/CT from the cited cards (19.10.2026).