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Polymer-housed ZnO arresters for overhead lines & pole transformers — 3–36 kV, 5/10 kA, 13 standard ratings

Distribution Arrester · YH5W / YH10W

Distribution Surge Arresters
3–36 kV · Polymer-Housed · Gapless ZnO

Gapless metal-oxide arresters for overhead distribution networks — protecting pole-mounted transformers, cable terminations and switchgear from lightning and switching overvoltages. Lightweight silicone housing with optional disconnector.

3–36 kVRated Voltage

5 / 10 kADischarge Current

Class 1IEC Line Discharge

13Standard Ratings

PolymerHousing

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Distribution Surge Arrester — YH5W / YH10W Series

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Model Specifications

How to read the model number: YH10W-12 = Y ZnO varistor · H Polymer housing · 10 10 kA · W Gapless · 12 12 kV rated. Each model available in multiple creepage grades — see Creepage & Environment. All residual voltages are peak (crest) values.

Creepage 25–56 mm/kV · General outdoor distribution · Moderate pollution, inland, normal humidity

Model	Ur kV	MCOV kV	Creep. mm	Lightning ≤kV	Steep ≤kV	Switch. ≤kV	2ms A	L mm	Wt. kg
YH5W-3	3	2.55	169	8.6	9.9	7.3	150	110	1.03
YH5W-6	6	5.1	235	17.2	19.8	14.6	150	135	1.17
YH5W-9	9	7.65	301	25.8	29.7	21.9	150	160	1.33
YH5W-10	10	8.4	301	28.5	32.8	24.2	150	160	1.35
YH5W-12	12	10.2	367	34.4	39.6	29.2	150	185	1.48
YH5W-15	15	12.7	433	43.0	49.5	36.5	150	210	1.64
YH5W-18	18	15.3	499	47.5	54.6	40.3	150	235	1.76
YH5W-21	21	17.0	565	57.0	65.5	48.4	150	260	1.95
YH5W-24	24	19.5	631	66.5	76.4	56.5	150	285	2.11
YH5W-27	27	22.0	697	76.0	87.4	64.6	150	310	2.29
YH5W-30	30	24.4	763	83.7	96.2	71.1	150	335	2.38
YH5W-33	33	26.7	829	95.0	109.2	80.7	150	360	2.56
YH5W-36	36	29.0	900	104.5	125.2	88.8	150	385	2.67

Creepage 25–47 mm/kV · Clean indoor / dry climates · Lighter weight, shorter length

Model	Ur kV	MCOV kV	Creep. mm	Lightning ≤kV	Steep ≤kV	Switch. ≤kV	2ms A	L mm	Wt. kg
YH5W-3	3	2.55	140	8.4	9.6	7.0	150	85	1.09
YH5W-6	6	5.1	205	16.8	19.2	14.2	150	110	1.28
YH5W-9	9	7.65	270	25.2	28.8	21.3	150	135	1.47
YH5W-10	10	8.4	270	27.9	32.0	23.7	150	135	1.47
YH5W-12	12	10.2	335	33.6	38.6	28.4	150	160	1.66
YH5W-15	15	12.7	400	42.0	48.0	35.5	150	185	1.83
YH5W-18	18	15.3	465	46.5	53.5	39.5	150	210	2.03
YH5W-21	21	17.0	530	55.8	64.1	47.4	150	235	2.23
YH5W-24	24	19.5	600	65.1	74.8	55.3	150	260	2.43
YH5W-27	27	22.0	675	74.4	85.5	63.2	150	285	2.59
YH5W-30	30	24.4	750	83.7	96.2	71.1	150	310	2.82
YH5W-33	33	26.7	855	93.0	106.9	79.0	150	360	3.15
YH5W-36	36	29.0	920	102.0	117.6	87.7	150	385	3.35

Creepage 31–41 mm/kV · Coastal, chemical plants, desert dust, cement factories · Extra sheds, heavier build

Model	Ur kV	MCOV kV	Creep. mm	Lightning ≤kV	Steep ≤kV	Switch. ≤kV	2ms A	L mm	Wt. kg
YH5W-3	3	2.55	120	8.2	9.4	7.0	150	90	1.31
YH5W-6	6	5.1	240	16.4	18.8	14.0	150	113	1.63
YH5W-9	9	7.65	369	24.6	28.2	21.0	150	157	2.09
YH5W-10	10	8.4	369	27.0	30.9	22.8	150	157	2.09
YH5W-12	12	10.2	432	32.8	37.6	28.0	150	175	2.33
YH5W-15	15	12.7	510	41.0	47.0	35.0	150	198	2.64
YH5W-18	18	15.3	576	45.0	51.5	38.0	150	218	2.90
YH5W-21	21	17.0	693	54.0	61.8	45.6	150	259	3.34
YH5W-24	24	19.5	780	63.0	72.1	53.2	150	281	3.73
YH5W-27	27	22.0	837	72.0	82.4	60.8	150	312	3.90
YH5W-30	30	24.4	975	81.0	92.7	68.4	150	343	4.34
YH5W-33	33	26.7	1122	90.0	103.0	76.0	150	386	4.78
YH5W-36	36	29.0	1188	99.0	113.3	83.6	150	406	5.01

Creepage 25–54 mm/kV · General heavy-duty distribution · Higher lightning regions, critical feeders

Model	Ur kV	MCOV kV	Creep. mm	Lightning ≤kV	Steep ≤kV	Switch. ≤kV	2ms A	L mm	Wt. kg
YH10W-3	3	2.55	164	9.0	10.3	7.6	250	110	1.03
YH10W-6	6	5.1	230	18.0	20.6	15.2	250	135	1.32
YH10W-9	9	7.65	296	27.0	30.9	22.8	250	160	1.51
YH10W-10	10	8.4	296	30.0	34.5	25.5	250	160	1.51
YH10W-12	12	10.2	362	36.0	41.2	30.4	250	185	1.75
YH10W-15	15	12.7	428	45.0	51.5	38.0	250	210	2.01
YH10W-18	18	15.3	494	50.0	57.5	42.5	250	235	2.24
YH10W-21	21	17.0	560	60.0	69.0	51.0	250	260	2.51
YH10W-24	24	19.5	626	70.0	80.5	59.5	250	285	2.69
YH10W-27	27	22.0	692	80.0	92.0	68.0	250	310	2.95
YH10W-30	30	24.4	758	88.2	100.8	74.7	250	335	3.47
YH10W-33	33	26.7	825	99.0	112.0	83.0	250	360	3.38
YH10W-36	36	29.0	900	108.0	124.2	91.8	250	385	3.56

Creepage 25–48 mm/kV · Space-limited / RMU / indoor · Denser ZnO — lower residual in compact form

Model	Ur kV	MCOV kV	Creep. mm	Lightning ≤kV	Steep ≤kV	Switch. ≤kV	2ms A	L mm	Wt. kg
YH10W-3	3	2.55	146	8.8	10.1	7.4	250	85	1.19
YH10W-6	6	5.1	211	17.6	20.2	14.8	250	110	1.52
YH10W-9	9	7.65	276	26.4	30.3	22.2	250	135	1.69
YH10W-10	10	8.4	276	29.4	33.6	24.9	250	135	1.69
YH10W-12	12	10.2	341	35.2	40.4	29.6	250	160	1.99
YH10W-15	15	12.7	406	44.0	50.5	37.0	250	185	2.32
YH10W-18	18	15.3	471	49.0	56.0	41.5	250	210	2.63
YH10W-21	21	17.0	536	58.8	67.2	49.8	250	235	2.93
YH10W-24	24	19.5	601	68.6	78.4	58.1	250	260	3.18
YH10W-27	27	22.0	675	78.4	89.6	66.4	250	285	3.33
YH10W-30	30	24.4	750	88.2	100.8	74.7	250	310	3.68
YH10W-33	33	26.7	861	98.0	112.0	83.0	250	360	4.00
YH10W-36	36	29.0	926	107.8	123.2	91.3	250	385	4.27

Data source: Hossin (Xiya Electric) YH5W/YH10W catalogue Tables 1–5 · See Creepage & Environment section for detailed grade selection guide by pollution level.

YH5W vs YH10W — Which to Choose?

Parameter	YH5W (5 kA Normal Duty) / YH10W (10 kA Heavy Duty)
2ms Rectangular Impulse	150 A / 250 A
4/10µs High Current	65 kA / 100 kA
Line Discharge Class	Class 1 / Class 1
Creepage Grade Options	Standard · Compact · Heavy Pollution / Standard · Compact High-Performance
Recommendation	YH5W for standard distribution lines · YH10W for high-lightning areas, critical feeders or where extra energy margin is needed

📄 Need a Datasheet?Full specs with dimensional drawings — request by model number. Get Datasheet →

How to Pick the Right Creepage Grade

Same YH5W-12, five different parameter sets. The difference is where you install it. Match your site conditions to the grade using the IEC 60815 pollution levels below.

Pollution Level	Light (I)	Medium (II)	Heavy (III)	Very Heavy (IV)
IEC 60815 Min Creepage	16 mm/kV	20 mm/kV	25 mm/kV	31 mm/kV
Typical Environment	Clean indoor · Low humidity	Inland rural · Light industry	Coastal ≤10 km · Industrial · High humidity	Coastal ≤1 km · Chemical · Desert dust · Heavy salt fog
Match This Grade	Compact (all series)	Standard (all series)	Standard works; Heavy for extra margin	Heavy Pollution — don’t compromise

Grade Labels on Model Numbers

When ordering, specify the grade after the standard model — for example YH5W-12-H for Heavy Pollution. If no suffix, Standard grade is supplied by default.

Suffix	— (none)	—C	—H
Creepage Grade	Standard	Compact / Light	Heavy Pollution / Compact HP
Best Match (IEC 60815)	Level I–II (light to medium)	Level I (clean indoor/dry)	Level III–IV (heavy to very heavy)
Typical 12 kV Creepage	335–367 mm (YH5W) / 341–362 mm (YH10W)	335 mm (YH5W) / 341 mm (YH10W)	432 mm (YH5W) / — (YH10W uses Standard for III)

For the full parameter breakdown of each grade, switch between tabs in the Specifications section above. Not sure which you need? Tell us your site location — we’ll recommend.

Approximate Dimensions

Silicone polymer housing. Optional disconnector adds ~40 mm. Custom brackets available.

Rated Voltage kV	Overall Height mm	Big Shed Ø mm	Small Shed Ø mm	Typical Mount	Disconnector
3	~110	~105	~77	M12 bracket	Optional
6–9	~125	~105	~77	M12 bracket	Optional
10–12	~135–180	~105	~77	M12 bracket / cross-arm	Optional
15–18	~220	~105	~77	M16 bracket	Optional
21–24	~250–280	~105	~77	M16 bracket	Optional
27–30	~310	~105	~77	M16 bracket	Optional
33	~333	~105	~77	M16 bracket / cross-arm	Optional
36	~397	~105	~77	M16 bracket / cross-arm	Optional

Where These Are Used

🗼 Pole-Mounted Transformers

Mounted adjacent to distribution transformers on poles — first line of defence against lightning-induced overvoltages on 10–35 kV feeders.

🔌 Cable Riser Poles

At transitions from overhead to underground cable — protects cable terminations from travelling wave reflections.

🏘️ Overhead Distribution Lines

Installed at regular intervals along 10/35 kV distribution feeders in high-lightning-density areas to reduce line trip-outs.

⚡ Switchgear & RMU Protection

Compact polymer arresters inside ring main units and distribution switchgear panels.

Frequently Asked Questions

What’s the disconnector for?

A thermal disconnector (explosive bolt or ground lead disconnector) automatically isolates a failed arrester from the line — the line stays energised and the fault is visibly flagged for replacement. Recommended for overhead installations where outage is costly.

Polymer vs porcelain — which should I choose for distribution?

Polymer (silicone) is strongly recommended for distribution — it’s lighter (easier pole installation), hydrophobic (better in polluted/coastal areas), and safer on failure (no porcelain shattering). Porcelain is available if your specification requires it.

Can I get a specific voltage not in the table?

Yes — custom rated voltages between standard steps are available for OEM orders. Tell us your system’s nominal voltage and earthing type (effectively earthed / impedance earthed / isolated neutral) and we’ll calculate the correct Ur and MCOV.

What’s your minimum order quantity?

Standard models: flexible MOQ. We support small trial orders and samples so you can test before bulk. Contact us with your quantity and we’ll work something out.