METAL OXIDE FLAME PROOF RESISTORS

The WMO series Metal Oxide Film Resistors are manufactured using the latest technology to ensure a very stable resistive medium. The resistors are insulated with layers of flame proof epoxy. The WMO series offer a wide range of power rating (0.25W, 0.50W, 1W, 2W & 3W) having tolerance ranges of ±1 % & ±5 %

Description

SPECIFICATION
Type No.	WMO 25/ WMO 50 M	WMO 50/ WMO 100 M	WMO 100/ WMO 200 M	WMO 200 / WMO 300 M
Rated Power at 70’C	0.25 W / 0.50 W	0.50 W / 1 W	1 W / 2 W	2 W / 3 W
Resistance Range(E24 series)	0.1 E to 10 Meg	0.1 E to 10 Meg	0.1 E to 10 Meg	0.1 E to 10 Meg
Maximum working voltage at 70’c at normal air pressure	250V	350V	500V	500V
Maximum Over Load Voltage	500V	700V	1000V	1000V
Operating Temperature Range	-40ºC to + 150ºC	-40ºC to + 150ºC	-40ºC to + 150ºC	-40ºC to + 150ºC
Dielectric Strength	250V No break down Δ R max. ± 0.5%	350V No break down Δ R max. ± 0.5%	500V No break down Δ R max. ± 0.5%	500V No break down Δ R max. ± 0.5%

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CHARACTERISTICS

Terminal Strength	no damage Δ R max. ± 0.5%
Resistance to soldering heat (350ºC)	Δ R max. ± 0.5%
Solderability	good tinnin no damage
Temperature Cycling -40 ºC to ± 150 ºC	Δ R max. ± 0.25%
Life 1000 hours at Rated Power	Δ R max. ± 1%
Short time overload	Δ R max. ± 1%
Resistance to solvents	no damage

STANDARD RESISTANCE VALUE

E 24 Series

10	11	12	13	15	16	18	20	22	24	27	30
33	36	39	43	47	51	56	62	68	75	82	91

E 96 Series

100	102	105	107	110	113	115	118	121	124	127	130	133	137	140	143
147	150	154	158	162	165	169	174	178	182	187	191	196	200	205	210
215	221	226	232	237	243	249	255	261	267	274	280	287	294	301	309
316	324	332	340	348	357	365	374	383	392	402	412	422	432	442	453
464	475	487	499	511	523	536	549	562	576	590	604	619	634	649	665
681	698	715	732	750	768	787	806	825	845	866	887	909	931	953	976

DIMENSIONS (in mm)

TYPE WMO 25 / WMO 50 M	H = 26 ± 2	L = 6.0 ± 0.4	D = 2.2 ± 0.1	d = 0.50 ± 0.05
TYPE WMO 50 / WMO 100M	H = 26 ± 2	L = 9.0 ± 0.5	D = 3.2 ± 0.2	d = 0.60 ± 0.05
TYPE WMO100 / WMO 200M	H = 26 ± 2	L = 11 ± 1.0	D = 4.3 ± 0.5	d = 0.65 ± 0.05
TYPE WMO 200 / WMO 300M	H = 26 ± 2	L = 15 ± 1.0	D = 5.0 ± 0.5	d = 0.75 ± 0.05