Does the DSP cause the RCD to trip?

As the DSP surge protection component is MOV type between L-N ,N-E, there may be a very small leakage current from Live to earth caused by the MOV normal operation. The RCD may see this as an imbalance between its live and neutral currents thereby causing the RCD to trip. Suggest fit the DSP before the RCD i.e. on the RCD's input terminal side. DSP is a device that is fitted in parallel across the L-N and earth.

Where should you install a DSP when you have an RCD installed?

Best to put the DSP before the RCD.

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DSP3P-100DM-T1+T2

Mains Spike & Surge Protection for Medical Equipment, Buildings, Telecom Units & Satellite/VSAT

The Sollatek D100 is a class I & II combined surge protection device. This highly efficient lightning surge arrestor is suitable for all installations where risk of surge and spike activity is particularly high, as in telecom installations, oil rigs, and open exposed areas with metal structures.

Features

Combined class I & II
Up to 100kA class I protection
Compact DIN rail mount for easy install in the field
Can be provided pre-installed in Sollatek 3 phase stabilisers*
Visual Indication of fault
Volt-free contacts for remote indication
5 year no-quibble warranty

Description

The SollatekDSP3P-100DM-T1+T2 is a Type I & II surge 3 Phase protection device. This highly efficient lightning surge arrestor is suitable for all installations where risk of surge and spike activity and, particularly due to nearby lightning activity, is high, as in telecom installations, oil rigs, and open exposed areas with metal structures. This unit should be installed in all building and sites at high risk (where a Lightning Protection System is in place and there is risk to human life such as schools, hospitals etc), and especially in climates where storms are frequent (NG > 25) or in the presence of overhead electric lines.

Specification

Phase	3
Type	Type I&II
Nominal discharge current (8/20 µs)/pole [In]	30kA
Nominal discharge current (8/20 µs)/pole [In]	70kA
Unit’s total kA	240kA (8/20µs) / 100kA (10/350µs)
Voltage protection level [Up]	1.5kV
Impulse discharge Current (10/350u/pole) [Iimp]	25kA

Downloads
Brochures
- Voltsafe Suppressor Brochure July 2014 (3MB)
Datasheets
- Voltsafe DSP3P-D100 (919KB)
Instruction Manuals
- DSP1P-DSP3P Instruction Manual (6 MB)
Click on the question to get the full answer.

Does the DSP cause the RCD to trip?
As the DSP surge protection component is MOV type between L-N ,N-E, there may be a very small leakage current from Live to earth caused by the MOV normal operation. The RCD may see this as an imbalance between its live and neutral currents thereby causing the RCD to trip. Suggest fit the DSP before the RCD i.e. on the RCD's input terminal side. DSP is a device that is fitted in parallel across the L-N and earth.
Where should you install a DSP when you have an RCD installed?
Best to put the DSP before the RCD.
What MCB rating does one use for the Live wire on the DSP-1P?
It uses the B32 rating.
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