About the BY2 Surge Arrestor

The BY2 Surge Arrestor is part of the ELEHPD Surge Arrester range. BY2 Surge protective device (Surge Arrestor) BY2-30/2.5 BY2-60/2.5 BY2-60/4.0 Specificaton Type Uc (v) Peak (kV) Q (As) Up (kV) Ip(kA) BY2-30/2.5 385 30 15 <2.5 4.5 BY2-30/4.0 385 30 15 <4.0 4.5 BY2-60/2.5 385 60 30 <2.5 6.0 BY2-60/4.0 385 60 30 <4.0 6.0 Usage and the Scope of Application BY2 type SPD is suiting to A.C 50/60 Hz, 380V and the following electric power systems, such as T ELEHPD manufactures and exports low voltage electrical products from Yueqing, Zhejiang, China, supplying distributors, panel builders, M&E contractors and OEM buyers worldwide.

Typical applications

Consumer units and distribution boards in residential buildings
Commercial and retail fit-outs where selective protection is required
Industrial control panels and machine-builder assemblies
Solar PV, EV charger and battery-storage sub-circuits
OEM equipment where a DIN-rail protective device is specified

How to specify the right Surge Arrester

Match the rated current to the circuit design current, then check the cable ampacity
Pick the trip curve to the load: B for resistive/lighting, C for general mixed loads, D for motors and transformers
Confirm the breaking capacity meets the prospective short-circuit current at the point of installation
Verify the pole configuration (1P, 1P+N, 2P, 3P, 3P+N, 4P) against the system earthing arrangement

Specifications

BY2 Surge protective device (Surge Arrestor)

Q: What is the difference between an MCB and an MCCB?

An MCB (miniature circuit breaker) is a DIN-rail device for final circuits, typically rated up to 125 A with a fixed trip curve. An MCCB (moulded case circuit breaker) is a larger device for main and sub-main distribution, usually 16 A to 1600 A, with adjustable thermal and magnetic settings and a higher breaking capacity. Use an MCB for branch circuits and an MCCB where you need adjustability or higher fault ratings.

Q: How do I choose between a Type B, C and D trip curve?

Type B trips between 3 and 5 times rated current and suits resistive loads such as lighting and heaters. Type C trips between 5 and 10 times and is the general-purpose choice for socket circuits and mixed loads. Type D trips between 10 and 20 times and is used for loads with high inrush, such as motors, transformers and large LED drivers.

Q: What does 6 kA breaking capacity mean in practice?

It is the maximum prospective short-circuit current the device can safely interrupt. 6 kA covers most domestic and light commercial installations. Where the transformer is close and the fault level is higher, specify 10 kA devices so the breaker still clears the fault without damage.

Q: Can these devices be supplied with your own brand?

Yes. OEM branding, buyer-specific labels, custom carton print and private-model numbering can be arranged on qualified order volumes.

BY2-30/2.5

BY2-60/2.5

BY2-60/4.0

Specificaton

Type	Uc (v)	Peak (kV)	Q (As)	Up (kV)	Ip(kA)
BY2-30/2.5	385	30	15	<2.5	4.5
BY2-30/4.0	385	30	15	<4.0	4.5
BY2-60/2.5	385	60	30	<2.5	6.0
BY2-60/4.0	385	60	30	<4.0	6.0

Usage and the Scope of Application

BY2 type SPD is suiting to A.C 50/60 Hz , 380V and the following electric power systems, such as TT , IT ,TN-S , TN-C and TN-C-S . The product functions as equi-potential connection in case of lightning striking at the joint of LPZOA and LPZ1 or LPZOS and LPZ1. It protects the electric network shocked by the thunder or surge over voltage and it also can be used in the TT system when combined with the voltage limiting SPD formed as the " 3+1 "type.

Technical Parameters

	BY2-30/2.5	BY2-30/4.0	BY2-60/2.5	BY2-60/4.0
Maximum continuous operating voltage Uc	385V AC	385V AC	385V AC	385V AC
Power frequency arcing voltage Uf	> 1.0kV	> 1.5kV	> 1.0kV	> 1.5kV
Test grade	Class ?	Class ?	Class ?	Class ?
Insulating resistance (Risol)	> 5 M O	> 5 M O	> 5 M O	> 5 M O
Voltage protective level Up	< 2.5 kV	< 4.0 kV	< 2.5 kV	< 4.0 kV
Response time ns	< 100 ns	< 100 ns	< 100 ns	< 100 ns
Impulse peak current	30 kA	30 kA	60 kA	60 kA
Electric charge Q	15As	15As	30As	30As
Nominal discharge current In(8/20 µ s) kA	100 kA	100 kA	200 kA	200 kA
Rated disconnection follow current ＆#118alue Ip	4.5kA/250V	4.5kA/250V	6.0kA/250V	6.0kA/250V
The rated current of fuse	125A	125A	250A	250A
Defending grade	IP20	IP20	IP20	IP20

Main Structure and Operating Principle

In figure 6, the electrodes are connected to the L /N line and PE line responsively , between the electrodes there will produce the electric interval . 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 conduct and release the energy by arc light .As the impulse wave through it and after disappear, the protective device will recover to high resistance and not influence the normal operating .

Appearance and Installation Dimension

Installation Location and Application

SPD Class 1 ,functioning as an equi-potential connection in case of lightning.

Installed at the joint of the LPZOA, LPZOB and LPZ1 zones.

It is usually installed in low voltage main distribution cabinet connected to the incoming end of the buildings.

It adopts 35 mm DIN rail and is linked by 2.5 -- 35 mm² copper wire, the earth cable should choose the double color wire which is over 4 mm².

Frequently asked questions about the BY2 Surge Arrestor

What is the difference between an MCB and an MCCB?

An MCB (miniature circuit breaker) is a DIN-rail device for final circuits, typically rated up to 125 A with a fixed trip curve. An MCCB (moulded case circuit breaker) is a larger device for main and sub-main distribution, usually 16 A to 1600 A, with adjustable thermal and magnetic settings and a higher breaking capacity. Use an MCB for branch circuits and an MCCB where you need adjustability or higher fault ratings.

How do I choose between a Type B, C and D trip curve?

Type B trips between 3 and 5 times rated current and suits resistive loads such as lighting and heaters. Type C trips between 5 and 10 times and is the general-purpose choice for socket circuits and mixed loads. Type D trips between 10 and 20 times and is used for loads with high inrush, such as motors, transformers and large LED drivers.

What does 6 kA breaking capacity mean in practice?

It is the maximum prospective short-circuit current the device can safely interrupt. 6 kA covers most domestic and light commercial installations. Where the transformer is close and the fault level is higher, specify 10 kA devices so the breaker still clears the fault without damage.

Can these devices be supplied with your own brand?

Yes. OEM branding, buyer-specific labels, custom carton print and private-model numbering can be arranged on qualified order volumes.