Modular voltage surge arresters 8/20 conforming to the latest IEC standard Class II (Type 2), developed to protect against the effects of indirect lightning strikes and resultant induced voltages. Two choices of nominal voltage options are available.
When selecting the nominal voltage required the voltage should be selected on the basis of L-N or L-Earth depending on the system. The standard version recommended for 380-550V L-L or 220-320V L-N systems is the 320V version. For 110V L-L systems use the 150V version, according to IEC-61643-11.
The units are suitable for AC single phase or three phase and are “purchased per pole”, thus a TP&N system requires 4 units (if a Neutral is present, it must be protected). Wiring is in parallel with discrimination fuses or a MCB fitted. For systems of >125 Amps fuses 125 Amps gG are recommended. The secondary side of each pole needs to be bonded down to Earth.
All units have a front mechanically driven flag indicator, green for healthy and red for fault. Additionally “CR” versions also have a mechanically driven auxiliary C/O contact. In a healthy state the contact is made between terminals 11 & 12. In the event of the MOV’s failing due to an intense or multiple surges the contact will change state to 11 & 14 (also indicated by the red flag). In this state protection has been lost, the unit will need replacing. A feature of the PROTEC units is that the MOV module is plug in and can be replaced without disconnecting the unit or isolating the system.
Category: Class II / Type 2
Protection mode: L/N – Earth
Protection via: High energy MOV’s (Metal Oxide Varistors)
Nominal discharge current: 20KA
Max discharge current: 40KA
Response time: <25n Sec
Thermal protection: Yes
Back up fuse if mains >125 Amps: 125 Amps gG
Short circuit withstand current: 25KA / 50Hz
Operating temperature range: -40°C to +85°C
Terminal cross section:
Max 35mm² solid cable
Max 25mm² stranded cable
Module size: 1 (18mm)
Optional auxiliary contact: Yes, (CR version)
Contact rating: 250VAC/0.5 Amps / 125VAC/3 Amps
Max AC continuous voltage L-N/L-E: 150V / 320V
<1.0KV (150V version)
<1.5KV (320V version)
TYPE (WITHOUT AUXILIARY CONTACT)
PROTEC C 40/150 (50.A064)
PROTEC C 40/320 (50.A045)
TYPE (WITH AUXILIARY CONTACT)
PROTEC CR 40/150 (50.A069)
PROTEC CR 40/320 (50.A046)
SPARE MOV MODULES
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