Parameter Specification Notes / Explanation Series / Type System Pro M - GS Rotary Switch-Disconnector (Special Version) Device Type 3-Pole Load Break Switch-Disconnector with Integrated Low-Current Fuse Standard Compliance IEC/EN 60947-3, IEC/EN 60947-1 Poles 3 Poles (Main Circuit) Main Circuit Ratings • Rated Operational Voltage (Ue) 690 V AC • Rated Insulation Voltage (Ui) 800 V AC • Rated Operational Current (Ie) 63 A (AC-23A) The 251 in GS251S indicates the 63A frame size. Breaking Capacity • Rated Conditional Short-Circuit Current (Icq) Typically 10-15 kA (when backed by specified upstream fuses) Requires backup fuse. Handle (C16) • Type Front-mounted, rotary handle with a large black knob. For manual operation and padlocking. • Locking Can be padlocked in the OFF position (usually 1-2 padlocks). Essential for LOTO. Special Feature (/0.03) Key Feature • Description Integrated low-current fuse holder or protection link for an auxiliary circuit. • Rated Current 0.03 A (30 mA) gG or similar characteristic. • Protected Circuit Type Likely a set of dedicated low-current auxiliary contacts or a separate isolated terminal pair for control/signaling. Purpose is to protect sensitive external control devices. • Physical Form Could be a 5x20mm or similar miniature fuse housed within the switch body or handle assembly. Utilization Category AC-23A (For switching squirrel-cage motors) Mechanical Life ≥ 20,000 operations Electrical Life (AC-23A) ≥ 5,000 operations at full rated current Auxiliary Contacts The S version and /0.03 likely imply the presence of special auxiliary contacts with the low-current fuse in series with one of them. Standard auxiliary blocks may also be addable. Terminals Screw-clamp terminals. Main terminals accept larger cables. Connection Capacity Up to 35 mm² (for main terminals) Mounting Mounts on 35 mm DIN Rail (EN 60715). Protection Degree IP40 (with handle installed) Ambient Temperature Operating: -25°C to +70°C Dimensions (W x H x D) Approx. 80 mm x 135 mm x 120 mm (for 3-pole unit) Weight Approx. 0.7 kg (without fuses)