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SF4-DC60V Datasheet(PDF) 5 Page - Nais(Matsushita Electric Works) |
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SF4-DC60V Datasheet(HTML) 5 Page - Nais(Matsushita Electric Works) |
5 / 7 page 262 SF If the two form “a” contacts (Nos. 2 and 4) weld, the armature becomes non-operational and the gap between the two form "b" contacts is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured. Form “a” Contact Weld If the No. 2 contact welds. Each of the two form "b" contacts (Nos. 1 and 3) maintains a gap of greater than 0.5 mm .020 inch. No.4 No.3 No.1 No.2 Energized No.4 No.3 No.1 No.2 Non-energized (when no. 2 contact is welded) No.4 No.3 No.1 No.2 Contact No. No.1 No.2 No.3 No.4 Terminal No. 11–12 7–8 5–6 9–10 State of other contacts 1234 Welded terminal No. 1 >0.5 >0.5 2 >0.5 >0.5 3 >0.5 >0.5 4 >0.5 >0.5 Note: Contact gaps are shown at the initial state. If the contacts change state owing to loading/breaking it is necessary to check the actual loading. >0.5: contact gap is kept at min. 0.5 mm .020 inch Empty cells: either closed or open Contact No. Contact No. The table below shows the state of the other contacts when the current through the welded form “a” contact is 0 V and the rated voltage is applied through the form “b” contact. Contact Operation Table 1) 2a2b Type If the form “b” contacts (Nos. 1 and 3) weld, the armature becomes non-operational and the contact gap of the two form “a” contacts is maintained at greater than 0.5 mm .020 inch. Reliable isolation is thus ensured. Form “b” Contact Weld If the No. 1 contact welds. A gap of greater than 0.5 mm .020 inch is main- tained at each of the two form "a" contacts (Nos. 2 and 4). No.4 No.3 No.1 No.2 Non-energized No.4 No.3 No.1 No.2 Energized (when no. 1 contact is welded) THE OPERATION OF SF RELAYS (when contacts are welded) SF relays work to maintain a normal operating state even when overloading or short-circuit currents occur. It is also easy to include weld detection circuits and safety circuits in the design to ensure safety even if contacts weld. |
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Similar Description - SF4-DC60V |
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