AC AND DC OPERATION
IEC 60947, EN 60947 (VDE 0660). The LSD contactors are climate-proof. They are finger-safe according to EN 50274. Size size 00 contactors have an auxiliary contact integrated in the basic unit. The basic units of sizes 0 to 3 contain only the main current paths. All basic units can be extended with auxiliary contacts and contact blocks. CONNECTION METHODS
The LSD contactors are available with screw terminals (box terminals and connecting bars) or with Cage Clamp terminals. The size 3 contactors have removable box terminals for the main conductor connections. This permits connection of ring terminal lugs or busbars.
If voltages ≤ 110 V and current ≤ 100 mA are to be switched, the auxiliary contacts of the LSD contactor or LSH auxiliary contactor should be used as they guarantee a high level of contact reliability. These auxiliary contacts are suitable for solidstate circuits with currents ≥ 1 mA at a voltage of 17 V.
SHORT-CIRCUIT PROTECTION OF THE CONTACTORS
Short-circuit protection of the contactors without overload relay, see Technical specifications. For short-circuit protection of the contactors with overload relay, see "Thermal Overload Relays". To assemble fuseless motor feeders you must select combinations of motor protection switches (MPS) and contactor.
LST thermal overload relays can be fitted to the LSD contactors for protection against overload. The overload relays must be ordered separately.
RATINGS OF INDUCTION MOTORS
The quoted rating (in kW) refers to the output power on the motor shaft (according to the nameplate).