DOLD 0060942 – MK9143N.38/600 45-65Hz UH AC400V | JUAL DOLD 0060942 – MK9143N.38/600 45-65Hz UH AC400V – Mains Frequency Monitor MK 9143N | Relay modules > Monitoring devices > Measuring relays / Monitoring relays > Measuring relays for main monitoring > MK 9143N > Mains Frequency Monitor > Mains Frequency Monitor MK 9143N > MK9143N.38/600 45-65Hz UH AC400V