BY40 Surge Arrestor

About the BY40 Surge Arrestor

The BY40 Surge Arrestor is part of the ELEHPD Surge Arrester range. BY40 Surge Arrestor from the ELEHPD Surge Arrester range. 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

BY40-40/2-420 BY40-40/4-420

BY40 type Surge Protective Device ( "SPD") is suitable for AC 50/60Hz ,380/440V and below electric power systems,such as asTT、IT、TN-S、TN-C、TN-C-S It protects the electric network shocked by the thunder or over voltage.
Working condition

       Height: not more than 2000m
       Operating temperature : normal -5~+40℃，
       Enlarge  range：-40~+80℃
       Relative humidity：on condition that room temperature 30%~90%
       Installed at no notability shocked and virated place
       Don't be contained in  explosion medium,the medium such as air and dust (including conduction dust )   shouldn't come to the degree that can corrode metal or damage insulation

Specification

BY40 series surge protective device

NO.	Type	Pole	Uc(V)	In(kA)	Imax(kA)	Up(V)	Application
1	BY40-10/1-140	1	140	5	10	＜0.8	≤AC110V ,Single phase DC ystem
2	BY40-10/1-275	1	275	5	10	＜1.2	TN-C、IT、TN-S single phase system
3	BY40-10/1-320	1	320	5	10	＜1.5
4	BY40-10/1-385	1	385	5	10	＜1.8	TT single phase system
5	BY40-10/1-420	1	420	5	10	＜2.0
6	BY40-10/2-140	2	140	5	10	＜0.8	AC110V and below single phase DC system
7	BY40-10/2-275	2	275	5	10	＜1.2	TN-C、IT、TN-S single phase sytem
8	BY40-10/2-320	2	320	5	10	＜1.5
9	BY40-10/2-385	2	385	5	10	＜1.8	TT single phase system
10	BY40-10/2-420	2	420	5	10	＜2.0
11	BY40-10/2Q-320	3	385	5	10	＜2.0	single phase with full protection mode
12	BY40-10/3N-275	2	275	5	10	＜1.2	complex type with full protection mode
13	BY40-10/3N-320	2	320	5	10	＜1.5
14	BY40-10/4-275	4	275	5	10	＜1.2	TN-C、IT、TN-S
15	BY40-10/4-320	4	320	5	10	＜1.5
16	BY40-10/4-385	4	385	5	10	＜2.0	TT
17	BY40-10/4-420	4	420	5	10	＜2.0
18	BY40-40/1-140	1	140	15	40	＜0.8	AC110V single phase DC sysstem
19	BY40-40/1-275	1	275	20	40	＜1.2
20	BY40-40/1-320	1	320	20	40	＜1.5
21	BY40-40/1-385	1	385	20	40	＜2.0
22	BY40-40/1-420	1	420	20	40	＜2.0
23	BY40-40/1-550	1	550	20	40	＜2.8	TT
24	BY40-40/2-140	2	140	15	40	＜0.8
25	BY40-40/2-275	2	275	20	40	＜14.2
26	BY40-40/2-320	2	320	20	40	＜1.5
27	BY40-40/2-385	2	385	20	40	＜1.8
28	BY40-40/2-420	2	420	20	40	＜2.0
29	BY40-40/2Q-320	3	320	20	40	＜1.5
30	BY40-40/2Q-385	3	385	20	40	＜2.0
31	BY40-40/3N-320	3	320	20	40	＜1.5
32	BY40-40/3N-385	3	385	20	40	＜1.8
33	BY40-40/3N-420	3	420	20	40	＜2.0
34	BY40-40/3-320	3	320	20	40	＜1.5
35	BY40-40/3-385	3	385	20	40	＜1.8
36	BY40-40/3-420	3	420	20	40	＜2.0
37	BY40-40/4-275	4	275	20	40	＜1.2	TN-C、TN-S-C、TN-S
38	BY40-40/4-320	4	320	20	40	＜1.5
39	BY40-40/4-385	4	385	20	40	＜1.8	TT
40	BY40-40/4-420	4	420	20	40	＜2.0
41	BY40-60/3-275	3	320	30	60	＜1.8	TN-C、TN-S-C、TN-S
42	BY40-60/3-320	3	320	30	60	＜2.0
43	BY40-60/4-275	4	320	30	60	＜1.8
44	BY40-60/4-320	4	320	30	60	＜2.0
45	BY40-60/3-385	3	385	30	60	＜2.5	TT
46	BY40-60/4-385	4	385	30	80	＜2.5
47	BY40-80/3-275	3	320	40	80	＜1.8	TN-C、TN-S-C、TN-S
48	BY40-80/3-320	3	320	40	80	＜2.0
49	BY40-80/4-275	4	320	40	80	＜1.8
50	BY40-80/4-320	4	320	40	80	＜2.0
51	BY40-80/3-385	3	385	40	80	＜2.5	TT
52	BY40-80/4-385	4	385	40	80	＜2.5

Remark:The item (1~52)can be enclosed alarm indication (the end of model with B), number :6~17、24~52 can be enclosed remote connection (the end of model with X).

Frequently asked questions about the BY40 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.