Motor Start Assemblies

Selection Tables for 380–400 V and 220–230 V Motors

Motor start assemblies are one of the most common and essential elements in industrial electrical systems. Correct selection of motor protection, contactors and cable cross‑sections ensures reliable operation, safe starting currents and long equipment life. This section provides practical tables for choosing components based on motor power, voltage and rated current. The data is suitable for panel builders, technicians and engineers working with industrial machines, conveyors, pumps, fans and general automation equipment.

The tables below cover two main voltage groups used in European industry:

  • Three‑phase 380–400 V
  • Single‑phase and low‑power 220–230 V

Values are based on commonly used PKZM motor protection devices and DILM contactors, which are standard in many industrial panels. Cable sizes follow typical installation conditions and are suitable for most applications unless otherwise specified by local regulations or manufacturer requirements.

1. Motor Start Assemblies – 380–400 V

Motor Start Assemblies – 380–400 V
Motor Power (kW) Rated Current (A) Motor Starter Main Contactor Delta Contactor (D) Star Contactor (Y) Incoming Cable (mm²) Terminal Wiring (mm²) Motor Cable (mm²)
4 8 PKZM0-10 DILM9-10 DILM9-01 DILM9-01 1.5 1.5 1.5
5.5 11 PKZM0-12 DILM9-10 DILM9-01 DILM9-01 2.5 1.5 1.5
7.5 15 PKZM0-16 DILM9-10 DILM9-01 DILM9-01 2.5 2.5 2.5
11 21 PKZM0-25 DILM17-10 DILM17-01 DILM17-01 4 4 4
15 29 PKZM0-32 DILM25-10 DILM25-01 DILM17-01 6 6 6
18.5 41 PKZM4-40 DILM25-10 DILM25-01 DILM17-01 10 8 8
22 59 PKZM4-50 DILM32-10 DILM32-01 DILM17-01 16 10 10
30 — PKZM4-58 DILM32-10 DILM32-01 DILM17-01 — — —

2. Motor Start Assemblies – 220–230 V

Motor Start Assemblies – 220–230 V
Motor Power (kW) Rated Current (A) Motor Starter Main Contactor Delta Contactor (D) Star Contactor (Y) Incoming Cable (mm²) Terminal Wiring (mm²) Motor Cable (mm²)
0.75 4 PKZM0-2.5 DILM9-10 DILM9-01 DILM9-01 1.5 1.5 1.5
1.1 5 PKZM0-4 DILM8-10 DILM9-01 DILM9-01 1.5 1.5 1.5
2 10 PKZM0-6.3 DILM9-10 DILM9-01 DILM9-01 2.5 1.5 1.5
4 16 PKZM0-16 DILM12-01 DILM12-01 DILM9-01 2.5 2.5 2.5
5.5 18.7 PKZM0-25 DILM17-10 DILM17-01 DILM9-01 4 4 4
7.5 23 PKZM0-32 DILM17-10 DILM17-01 DILM9-01 6 6 6
11 30 PKZM4-50 DILM25-10 DILM25-01 DILM9-01 10 8 8
15 47 PKZM4-63 DILM32-10 DILM32-01 DILM9-01 16 10 10
18.5 57 — — — — — — —

3. Notes and Practical Recommendations

Always verify motor nameplate current before selecting protection.

  • Cable sizes may vary depending on installation method, ambient temperature and length.
  • Star‑delta starters require three contactors: main, star and delta.
  • PKZM0 series is suitable for small and medium motors; PKZM4 is used for higher currents.
  • DILM contactors are selected based on AC‑3 category for motor loads.
  • For long cable runs, voltage drop must be checked.
  • Always follow local electrical regulations and manufacturer datasheets.