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IEC Switches and Disconnects Section 8

ML Disconnect Switches

Introduction Mounting 1Front mounting (flush mounting)2Rear mounting 3Main contact and PE- or N-terminals for 1 4Main contact and PE- or N-terminals for 2 5Auxiliary switch 1NO-1NC for 1 and 2 6Triple terminal shroud for 1 and 2 7Single terminal shroud for 3 and 4 The regulations EN 60204 part 1 and DIN VDE 0113 part 1 applyto the safety of machinery and the electrical equipment of machines. Main switches are described in paragraph 5.3 and emergency- stop equipment in paragraph 10.7. Main Switches A manually operated main switch must be provided for everymain circuit. It must be a switch-disconnector corresponding to utilization category AC23 (IEC 947-3), fulfilling the following requirements: 12 3 456 7 1. Disconnecting the electrical equipment from the main. 2. Visible contact indication or a disconnection function by con-struction (the handle is in the “OFF” position when all contacts are open). 3. If the main switch serves simultaneously as an emergency-stop switch, its handle should be red. Otherwise, black or gray handles are recommended. 4. It should be padlockable in the off position. 5. 6. All active conductors are to be disconnected from the main.The breaking capacity should be sufficient to break the current of the largest motor in a blocked state together with the sum of the operating currents of the remaining motors/loads. The handle of the main switch must be easily accessible and must lie between 24” – 74” (0.6 – 1.9 m) above the incomer level. Emergency-stop equipment The main switch may fulfill the function of an emergency-stopswitch on certain machines. The handles must be red on a yellow background. The contacts of a manually operated emergency- stop switch have to be opened by force (positive opening). Standards Complying with:—IEC 947-3 —DIN VDE 0660 —low voltage directive 73/73 EEC —low voltage directive EMC 89/336 EEC —UL508 —CSA —CE
Central Mounting Four-hole Mounting 8-2

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Rev. 05/07 Prices and data subject to change without notice