ERICO TDS-MOVTEC Surge Diverters - Manual (Page 10)

G L O B A L L I G H T N I N G T E C H N O L O G I E S
PAGE 10
5 VOLTAGE RATINGS
The TDS (Transient Discriminating
Suppressor) technology has been specifically
developed to cater for abnormal over-voltage
conditions that may occur on sites with poor
voltage regulation, or due to wiring or
distribution faults. The TDS units feature an
extremely high over-voltage withstand to
eliminate heat build up that can occur with
standard technologies when the protection
devices start to clamp on the peak of each
abnormal mains cycle.
Traditional MOV technology (eg MT-275V/
135K/A) is not suitable in applications
where sustained over-voltage conditions
can be experienced.
Examples of poorly regulated voltage
environments include:
• Smaller power generation supplies
• Sites with large earth currents
• Variable motor speed control circuits
• High harmonic voltage environments (non-
linear loads)
The TDS range of Movtecs with a higher
over-voltage withstand may be able to be
used in these environments following
advice.
Transient protection devices are usually rated
to protect against non-repetitive pulses from
such sources as direct or induced lightning
strikes. They are not designed to provide
protection against repeated cyclic anomalies.
Nor are they designed to provide protection