EMC Filters

In the vicinity of electronics and control systems, there is often high powered equipment and cabling. In these situations it is possible that electronic circuits can be affected by these mains carrying components in such a way that signals become corrupted. Corrupted signals, especially in industrial surroundings, can lead to faulty operations or the disruption of a production line. These interferences are caused by mains failure, harmonic distortion and transient switching voltages. The important frequency range lies mostly between 10 kHz and 100 MHz with the majority of this between 100 kHz and 10 MHz.

Mains filters are used to attenuate conducted interference without impairing the supply. These filters effectively attenuate both incoming interference which may affect sensitive equipment and also outgoing interference from the equipment to which they are connected and which may otherwise enter the mains supply. Typical sources of continuous interference are switch mode power supplies, motors and phase controllers.

• 1 Phase filters available from 1 - 20 Amps (supply voltage upto 250 VAC or 300 VDC)
• 3 Phase filters available from 3 - 180 Amps (supply voltage upto 600 VAC)

Suppressor Modules

Inductive loads should be suppressed to dampen the high switch-off voltage spikes that lead to contact pitting and interfere with neighbouring electronic controls.

Peak voltages will result in.

• Errors in the control sequence
• Defective control circuits
• Defective coil in contactors, valve, motor, transformer, relay
• Interference impairing functionality
• EMC problems
• Lost revenue resulting from downtime

For years now, Murrelektronik have been developing and manufacturing suppressor components that reduce the harmful effects of these voltage spikes.

Suppression Modules available for:

• Direct connection to motors
• Fitting right on contactors
• Solenoid valves and pressure switches
• Universal application

Filters and Surge Suppressors