509 dimensions are shown for reference purposes only. dimensions are in inches over (millimeters) unless otherwise specified. specifications and availability subject to change. www.tycoelectronics.com technical support: refer to inside back cover. p&b catalog 1308242 issued 3-03 operate data @ 25 c must operate voltage: 85% of nominal voltage or less. must release voltage: 15% of nominal voltage or more. operate time (including bounce): 20 ms, max. release time (including bounce): 15 ms, max. at or from nominal coil voltage 491 series ac coil 20 amp pc board or panel mount relay file e38802 file lr75282 contact ratings @ 23 c arrangements: 1 form a (spst-no), 1 form b (spst-nc) and 1 form c (spdt). material: silver-cadmium oxide. mechanical life: 10 million operations, at 300 ops/minute. electrical life: 100,000 operations at factory rated load, 6 ops/minute. minimum contact load: 1a @ 5vdc or 12vac. initial contact resistance: 50 milliohms @ 100ma, 6vdc). initial dielectric strength between open contacts: 1,500v rms, 1 minute. between contacts and coil: 1,500v rms, 1 minute. initial insulation resistance between mutually insulated elements: 10 9 ohms, min., @ 500vdc, 23 c and 50% r.h. coil data @ 23 c voltage: 12 to 220vac. nominal coil power: 2.0va, (approx.). maximum coil temperature (4) : class b: 130 c. class f: 155 c. duty cycle: continuous. coil data nominal dc resistance must operate must release voltage 10% (ohms) voltage (max.) voltage (min.) 12 26 10.2 1.8 24 106 20.4 3.6 110 2,750 93.5 16 220 11,000 187 33 features up to 20 amp switching in spst-no and 13.3 amp in spdt arrange- ments. washable, plastic sealed case available. meets ul 873 and ul 508 spacing ? 1/8" through air, 1/4" over surface. load connections made via 1/4" q. c. terminals. choice of ul class b or f insulation system. well suited for various industrial, commercial and residential applications. factory contact ratings voltage 1 form a 1 form b 1 form c (no) (nc) 240vac 20a 10a 13.3a 6.7a 28vdc 20a 6.7a 13.3a 6.7a contact ratings @ 23 c with relay properly vented. remove tape from vent hole after soldering and cleaning. users should thoroughly review the technical data before selecting a product part number. it is recommended that user also seek out the pertinent approvals files of the agencies/laboratories and review them to ensure the product meets the requirements for a given application. ul/csa contact ratings voltage load type 1 form a 1 form b 1 form c (no) (nc) 240vac general purpose 30a 15a 20a 10a 240vac resistive * 30a 15a 20a 10a 240vac motor 2 hp 1/2 hp 2 hp 1/2 hp 120vac motor 1 hp 1/4 hp 1 hp 1/4 hp 240vac lra/fla ** 80/30 30/10 50/20 20/7 120vac lra/fla 98/22 ? ? ? 120vac tungsten * tv5 tv3 tv5 tv3 277vac ballast 10a 3a 10a 3a 28vdc resistive 20a 10a 20a 10a mechanical data termination: printed circuit and quick connect terminals (4) . enclosures (all have 94v-0 flammability rating): open, unsealed dust cover or sealed case. weight: 1.2 oz. (33g) approx. notes (1) operating ambient temperature must consider must operate voltage change over temperature, contact temperature rise, coil temperature rise (if coil is not allowed to cool) and maximum coil temperature. (2) sealed relay terminals should not be bent. (3) remove tape after cleaning process for optimum life of sealed relays. (4) class b coils are ul systems approved for maximum coil temperature of 130 c, by change of resistance method. class f coils are ul systems approved for maximum coil temperature of 155 c, by change of resistance method. environmental data storage temperature range: -40 c to 130 c. operating temperature range (1) : -55 c to +85 c. vibration, operational: 0.065" (1.5mm) max. excursions from 10-55 hz. shock, operational: 10g for 11 ms. shock, mechanical: 100g. coil temperature rise
510 dimensions are shown for reference purposes only. dimensions are in inches over (millimeters) unless otherwise specified. specifications and availability subject to change. p&b catalog 1308242 issued 3-03 (pdf rev. 4-04) www.tycoelectronics.com technical support: refer to inside back cover. pc board layout (bottom view) wiring diagrams (bottom views) 1 form a 491-21t200 491-21q200 491-24t200 491-24q200 our authorized distributors are more likely to maintain the following items in stock for immediate delivery. ordering information typical part number b 491 -1 1 g 2 00 1. basic series: 491 = ac coil, printed circuit board/panel power relay. 2. enclosure & terminals: 1 = dust cover, pc terminal. 7 = sealed case, panel mount, .187 coil terminal. 2 = sealed case, pc terminal. 8 = open unit 6 = sealed case, panel mount, .110 coil terminal. 3. contact arrangement: 1 = 1 form c (spdt) 4 = 1 form a (spst-n o ) 5 = 1 form b (spst-n c ) 4. coil input: p = 12vac q = 24vac t = 120vac u = 220vac 5. contacts: 2 = silver-cadmium oxide 6. coil insulation and special features: 00 = standard, ul class b coil insulation system m0 = magnetic blowout (with enclosure 1 or 2 only, not ul or csa) f0 = special, ul class f coil insulation system a1 - e9 = special - customer specific features 1 form b outline dimensions 1.10 max. (28 max.) 1.08 max. (27.5 max.) 1.28 max. (32.5 max.) 1.71 (43.5) 1.71 (43.5) 1.99 max. (50.3 max.) 2 C 0.12 (3.2) dia. or m3 .25 qc (6.35) .11 qc (2.8) 3 C .25 qc (6.35) 1.18 max. (30 max.) .9 (22.9) .403 (10.24) .11 (2.8) .21 (5.4) .63 (16.2) 1.22 (31.1) .3 (7.7) .7 (17.8) .15 (3.8) .4 (10.2) .921 (23.4) 2 C .024 dia. (.6) 3 C .047 (1.2) 1.10 max. (28) 2 C .04 dia. (1) 3 C .08 dia. (2) .11 (2.8) .3 (7.7) .6 (2.54) .24 (6.1) .7 (17.8) .55 (17.8) .138 (3.5) 1.08 max. (27.5) 1.26 max. (32.5) .25 qc (6.35) 1 form c 491-61t200 491-61q200 491-64t200 491-64q200 open style sealed case for pc board mounting sealed case for panel mounting mounting hole pattern reference only
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