New contactors and overload relays have to do much more than just basic functions of switching and protecting.

Continuous operation demands high operational reliability of the components used. DILM contactors therefore not only have an excellent lifespan in standard AC-3 operation, but are also ideally suited for severe AC-4 inching duty.

Safety is thus improved even during the setting up and conversion phases for machines and systems. Device characteristics providing active safety, such as interlocked opposing contacts, safe isolation and protection against direct contact, are of course standard features.

Both machine and switchgear manufacturers are looking for economical solutions for designing low-voltage switchgear assemblies.

DIL contactors and Z motor-protective systems fit ideally into the overall installation, allowing cost savings to be made. For example, coupling or interfacinglevels can be completely dispensed with in many places, since all contactors from the DILM185 and up are equipped with an electronically controlled drive which carries out this task. Furthermore, smaller transformers can be used, owing to the low pick-up and sealing power levels.

The system capability of the contactor and motor-protection range is evident in many ways. For example, one auxiliary contact can be used from the DIL 0M to the DILM 820, only four current sensors cover motor protection from 1A to 820A, and complete motor-starters can be formed from plug-in modules.

But system capability means more. Simple fitting and connection, matched to the respective current range for all switching devices, a wide range of motor-starter products for various coordination types, and the associated know-how.

• The contacts move at the ideal speed stored in the microprocessor.
• This optimum switching means increased switching capacity and lifespan.
• Three different coil terminals for direct connection without coupling levels.
• Suppressor circuits are already integrated.
• Voltage monitoring prevents operation at incorrect voltages.
• Brief voltage dips are bridged by design.