1. SPD II 1 for LV Power (AC/DC)
Welcome to this introduction to the SPD II 1 series of surge protectors for Low Voltage power applications, including Photovoltaic installations.
Surge Protection
SPD II 1 for LV Power (AC/DC)

2. Surge Protection ....for Power and I/O
SPD II 1
VARITECTOR VSPC
VARITECTOR VSSC
PLC
Power protection
Imax = 50kA (8/20μs)
Pluggable arrestor module
Local status indicator
Contact option for remote status larm
UL 1449 Edition 3
Signal protection
Imax = 20kA (8/20μs)
Pluggable arrestor module
Local status indicator
Group connection for remote status alarm
UL 497B
Signal protection
Imax = 20kA (8/20μs)
High density / low cost
4 or 6-terminal models
Local status indicator (6 terminal option)
UL 497B
Weidmuller offers ranges of industrial transient voltage surge protection devices for both ac power and process signalling installations.
The SPD II 1 range described here covers low voltage distribution applications – protecting a.c. nominal voltages between 120 and 480V - single and 3 phase – making it suitable for most control panel power input applications.
The construction of SPD II is in Din rail mounted format, with molded base with finger-safe electrical connections and pluggable replaceable arrestor.
The internal varistor (or MOV) – which is the transient voltage limiting element – has a thermal fuse which acts as a circuit disconnector in the event of the MOV leaking. When the disconnector operates, it shows by a red indicator on the front that the MOV is ready to be replaced. At the same time, the disconnector operates an internal relay, which provides an output signal for remote status indication, via the pluggable connectors fitted in the top of the base element.
VSSC NA Training 2011

3. SPD II 1 Key features 120V AC L
For power distribution (1ph – 3ph) Nom. Voltages 120 – 480Vac
Locate downstream of main breaker
Surge discharge (Imax) 50kA
Local status indicator + remote contact
UL 1449 Edition 3 approvals
120V AC
Fuse L L G TF
Thermal fuse
MOV
The SPD II 1 is used in voltage distribution networks, and is installed downstream of the main circuit breaker and fuse. It provides protection by being fitted electrically between the conductor to be protected, and a good quality ground.
The diagram on the left illustrates how the internal MOV, thermal fuse and relay components are connected together – and operate when leakage current is detected passing through the MOV.
SPD II 1 R 150V/40kA
( )
SPD II / June 2011

4. SPD II - 3 phase, 3 wire, 120V L1 120V AC L2 L3 SPD II 120V/40kA
Fuses L1
120V AC L2 L3
SPD parts needed:
Qty
Descriptor
Article # 3
SPD II 120V/40kA
Ground cable 1
QB18-3 (jumper)
Multiphase protection is made by connecting each live conductor to an SPD module.
To minimize the wiring on the ground side – a jumper is inserted to link the ground connection of each module – so that a single ground wire can be used.
The table illustrates the component list for nominal voltage 120V.
3 x SPD II 1 R 120V/50kA
( )
Insert
jumper
SPD II / June 2011

5. Features of SPD II 1 UL Type 2 – no fuse needed Imax 50kA (Imax)
Weidmuller branding
Optional spare arresters
SCCR 200kA
Ambient temp -40 to 70C
Remote / local status display
QB links for ground jumpering

6. SPD II 1 R – new arrester technology (1)
For non-transient over-voltages the TC(G) circuit controls the current (reducing it to mA) and thereby isolates and protects the MOV.
For transients to be discharged the GDT and MOV work together
In some SPDs it is possible for the MOV to prematurely wear out. An example of this is when the conductor being protected is part of a poorly regulated supply – and where the nominal voltage can increase above the MCOV of the MOV for a long period of time – i.e. not just a transient. In this condition the MOV will turn on, and drain current to ground. This is wasting energy, and will also cause the MOV to overheat and wear out in a shorter period of time.
The internal construction of the SPD II has additional components which are designed to ensure that the MOV will only discharge current to ground during a transient voltage event.

7. SPD II 1 R – new arrester technology (2)
Spring-loaded, rotating barrier prevents arcing during disconnection of MOV.
This in turn prevents hot spots being created in the MOV housing – which would have otherwise added to MOV wear and reduced it’s operating life.

8. Installing SPD II v. SPD II 1
SPD II 120V/40kA
SPD II 1 R 150V/40kA
LP = $46.31
LP = $70.52

9. Marketing support for SPD II 1
Fuse L
Online data sheets – available
Inventory in Richmond – available
Data Sheet – LIT 1308
Flyer – LIT 1306
Updated Demo rail – available
Hi definition photos – available
Launched Feb 2013

10. Any questions?

11. a n y q u e s t i o n s ?

12. SPD II 1 R – for LV power applications
Fuse L
Iskra partnership – first fruit
UL 1449 Ed 3 approval
Incorporates NEW SPD technology
Improves reliability
Improves quality of protection

13. Model types SPD II v. SPD II 1 R