BY4 Surge protective device

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BY4 Surge protective device

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E-Mail : sales@elecal.com

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BY4 - 60

BY4 - 80

BY4 - 100

Usage and application scope

BY4 type SPD is series surge protective device (protector in short) is applied in A.C 50/60 Hz , ≤380V electric power system such as TT,IT ,TN-S,TN-C and TN-C-S, and used at the equipotential connection of LPZ0A and LPZ31 zone or LPZ0B and LPZ1 zone, which protects the electric network shocked by the thunder or surge over voltage.
The protector can be made connecting with remote signaling contact, which is a normal open contact. If one or more of modular of the protector is in malfuction, the contact will be closed, and sending the malfunction signal. The rated value of remote signaling contact is AC36V,1A.
Maximum continuous operating voltage: Uc 320, 385VAC
test classification: II grade
voltage protection level: uP< 2.0 2.5 3.0 kV
max. discharging current (8/20s): Imax 60 80 100kA
Nominal discharge current (8/20s): In 30 40 60kA

Model and meaning

Note: combination mode: 3-3 pole combination, public pole connects to the earth.
3-3 pole combination, public pole connects to N
pole combination, public pole connects to the earth

Main Structure and Operating Principle
In three-phase four- line system , three phase lines and one zero line are connected protective device to the earth cable . (figure 1 ) . In normal situation , the protective device is high resistance , when the over voltage brings for electric network shocked by thunder or other reasons , the protective device will rapidly transmit in ns , then lead the voltage into earth and protect the electric equipment . As the surge voltage through the protective device and after disappear it will recover to high resistance and not influence the normal operating.

Technical Parameters

Item	BY4-60/3-385 BY4-60/3N-385 BY4-60/4-385	BY4-80/3-385 BY4-80/3N-385 BY4-80/4-385	BY4-100/3-385 BY4-100/3N-385 BY4-100/4-385
Maximum continuous operating voltage Uc	385 V
Test grade	Class 2
Nominal discharge current In(8/20s)	30kV	40kV	60kV
Maximum discharge current Imax (8/20s) kA	60kV	80kV	100kV
Voltage protective level Up	2.0 kV	2.5 kV	3.0 kV
Response time ns	< 25 ns
Defending grade	IP20
Ambient temperature	-40---- +85C
Color ( Mould )	Orange
( Base )	Grey
Outer covering material	Reinforced fire-retardant nylon PBT
Phase Line , Zero Line	6 ----3 5mm²
Earth Line	6 ----3 5mm²
Signal Line	1.5 mm²
Accessory	According to the needs adding the remote signaling contact

Item	BY4-60/3-320 BY4-60/3N-320 BY4-60/4-320	BY4-80/3-320 BY4-80/3N-320 BY4-80/4-320	BY4-100/3-320 BY4-100/3N-320 BY4-100/4-320
Maximum continuous operating voltage Uc	320 V
Test grade	Class 2
Nominal discharge current In(8/20s)	30kV	40kV	60kV
Maximum discharge current Imax (8/20s)	60kV	80kV	100kV
Voltage protective level Up	2.0 kV	2.0 kV	2.5 kV
Response time ns	< 25 ns
Defending grade	IP20
Ambient temperature	-40---- +85C
Color ( Mould )	Orange
( Base )	Grey
Outer covering material	Reinforced fire-retardant nylon PBT
Phase Line , Zero Line	6 ----3 5mm²
Earth Line	6 ----3 5mm²
Signal Line	1.5 mm²
Accessory	According to the needs adding the remote signaling contact

Installation position and application

1. SPD class B, functioning as an equi-potential connection in case of lightning.
2. Installed at the joint of the LPZOA, LZPOB and LPZ1 zones.
3. It is usually installed in low voltage main distribution cabinet connected to the incoming end of the buildings.
4. It adopts 35 mm DIN rail.
5. It is linked by 6 --- 35 mm² copper wire
6. The cable should choose double color wire which is longer than 6 mm²
7.. In order to guarantee electrical network's normal operating after protective device losing efficiency , the protective device which linked to the phase line must be connected a fuse box whose current is higher than 63A or a circuit breaker.

Appearance and Installation Dimension