Residual current block Vigi NG125, 4P, 63A, 300mA, type A, selective. Product or component type: Earth fault auxiliary block - Device short name: Vigi NG125 - Poles description: 4P - Network type: AC - Network frequency: 50/60 Hz - Earth fault sensitivity: 300 mA - Earth fault protection time delay: selective - Earth fault protection class: Class A.