97 MSS - technical sheet
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97 MSS ROTARY SWITCH DISCONNECTORS ROTARY SWITCH DISCONNECTORS - MSS Technical data TYPE Reference Standard: (Three-way switch) Rated current (In): No. poles: Rated operational voltage (Ue): Maximum operating voltage (max Ue): Rated insulation voltage (Ui): Rated impulse withstand voltage (Uimp): Voltage Category of use (1) AC-21 A / AC-21 B 400V AC AC-22 A / AC-22 B AC-23 A / AC-23 B AC-31 A / AC-31 B 415V AC AC-32 A / AC-32 B AC-33 A / AC-33 B AC-21 A / AC-21 B 500V AC AC-22 A / AC-22 B AC-23 A / AC-23 B AC-20 A / AC-20 B AC-21 A / AC-21 B 690V AC (2) AC-22 A / AC-22 B AC-23 A / AC-23 B DC-20 A / DC-20 B DC-21 A / DC-21 B 220V DC DC-22 A / DC-22 B DC-23 A / DC-23 B DC-20 A / DC-20 B DC-21 A / DC-21 B 400V DC DC-22 A / DC-22 B DC-23 A / DC-23 B DC-20 A / DC-20 B DC-21 A / DC-21 B 440V DC DC-22 A / DC-22 B DC-23 A / DC-23 B DC-20 A / DC-20 B DC-21 A / DC-21 B 500V DC DC-22 A / DC-22 B DC-23 A / DC-23 B Rated short-time withstand current (Icw): Rated short-circuit making capacity (Icm) (5): Conditional short-circuit current with fuse (Icc) (6): Conditional short-circuit current with miniature circuit breakers (Icc) (6): MT 60 MT 100 MTHP 160 MTHP 250 MTX 160c MTX/E 160 MTX 250 / MTX/E 320 MTX/E 630 MTX/E 1000 Pre-arrangement for lock in OFF position: Mechanical endurance: (n. of manoeuvre cycles) Maximum no. of auxiliary contacts that can be installed: Power loss at In: (W/pole) Minimum cable section: (mm2) Maximum cable section: rigid / flexible (mm2) Maximum busbar width: (mm) Rated tightening torque: (Nm) category with index A = frequent manoeuvres/category with index B = non-frequent manoeuvres; (2) with terminal covers or pole separation shield; (3) 4-pole device with 2 poles in series for each polarity; (4) 3-pole device with 2 poles in series for “+” and 1 pole for “-”; (5) indicates the peak current value for an operating voltage Ue = 400V AC; (6) for an operating voltage Ue = 400V AC; (7) connected directly on the frame; (8) also with terminals. *In the case of special needs the locking function can be set also in position I or II. For technical information contact the Technical Assistance Service or visit gewiss.com Technical Information

97 MSS ROTARY SWITCH DISCONNECTORS MSS ATS - AUTOMATIC TRANSFER SWITCH TECHNICAL DATA Thermal current Ith at 40°C Insulating voltage (Ui) - Power circuit Shock withstand voltage (Uimp) - Power circuit Shock withstand voltage (Uimp) - Command circuit Insulating voltage (Ui) - Command circuit Operational currents (Ie) (A) according to IEC 60947-3 Voltage Operational currents (Ie) (A) according to IEC 60947-6-1 Voltage Utilisation category Rated short-time withstand current 1s (Icw) Dynamic seal in short-circuit (2) Presumed short-circuit current (2) Associated fuse gauge (2) Connection...

97 MSS ROTARY SWITCH DISCONNECTORS Description This device ensures the automatic switching (while live) of two low voltage networks (network-emergency power unit or network-network). Its extremely compact size means it can be installed even in 46QP range boards and CVX630K / CVX630M structures, by assembling on a standard DIN rail (EN50022). The simple product set-up, various operating logics (with excludable automatic return to a priority line) and selfpowering system (taking L-N directly from the priority line) make this a highly practical, competitive product. Product set-up Wiring the...

97 MSS ROTARY SWITCH DISCONNECTORS Operation 3 Use the fourth switch to select the switching mode: G for network-emergency power unit , H for network-network. Programming thresholds and times Rated voltage setting (there are 2 scales: PN for single-phase and PP for three-phase) • ΔU / ΔF Setting of the percentage tolerance value for voltage and frequency fluctuations on the priority line. The setting of this trimmer identifies a range (for example ±10%) that the Voltage and Frequency parameters must remain in. If one of the two parameters on the priority line emerges from this range, the...

97 MSS ROTARY SWITCH DISCONNECTORS Wiring the terminal block Terminals Application Network - Emergency power unit Network - Emergency power unit 207 / 209 Network - Network Contact status Description Automatic return to network I Without automatic return Operation with priority network Operation without priority network TEST function stop TEST function start Priority line I Priority line II Network - Emergency power unit Network - Network Automatic mode Network - Emergency power unit Network - Network Correct product operation Network - Emergency power unit Automatic mode inhibition...

97 MSS ROTARY SWITCH DISCONNECTORS MODE 1: Network - emergency power unit switching, with automatic return to priority line MODE 2: Network - emergency power unit switching, without automatic return to priority line In this case, the emergency power unit must be connected to line II. Following a blackout or instability of priority line I, the MFT time count begins; at the end, the start-up command is sent to the emergency power unit . When the generator is at full speed, the device waits 5s and then switches to line II. MODE 1: If priority line I returns to full speed, the MRT time count...

97 MSS ROTARY SWITCH DISCONNECTORS Locking function - Choosing the positions The locking function is only possible in position 0 or, in the case of special needs, also in position I or II. The device is designed so that the padlock can only be fitted in position 0. To change this setting, adjust the screw on the back of the automatic transfer switch: Assembly on DIN rail (IEC 60715) The device can be assembled on a normal DIN rail. To ensure the stability of the product and prevent it sliding on the rail, position it and then tighten the screws on its right side. Further information •...

97 MSS ROTARY SWITCH DISCONNECTORS Dimension tables MSS 125 Direct front control External front control 118 min. External front control Direct front control External front control MSS 250-630 Direct front control External frontal control Direct frontal control For technical information contact the Technical Assistance Service or visit gewiss.com