The magnetic coils (AC operation) are available in two sizes:

• 3RT2924
  for 3-pole contactors 3RT2023, 3RT2024, 3RT2025
• 3RT2926
  for 3-pole contactors 3RT2026, 3RT2027, 3RT2028 and
  for 4-pole contactors 3RT2325, 3RT2326, 3RT2327 and 3RT2526

Note:

Contactors with AC and DC coils have different depths. Coils can only be replaced in the case of AC contactors and this is only possible with AC coils.