Butt Contact Pushbutton Switches SERIES 39 SPST and SPDT, 1/4 Amp FEATURES •Fully Protected During Flux Cleaning Operations DIMENSIONS in inches (and millimeters) SPDT–PC Mount Large Button Style .500±.015 (12,7±0,38) 39-261* .187±.010(4,75±0,25)DIA. .328±.015 (8,33±0,38) Rating at 28 Vdc Resistive 150 mA .270(6,86)REF. 1 /4 Amp .100±.010(2,54±0,25) 1 /8 Amp Momentary Operations at Rated Load 500,000 Partial Part Number 39-251* 39-261* Actuating Force (oz.) .090 + .010/ – .015 (2,29 + 0,25/ – 0,38) 10 ± 3 oz. .030±.002(0,76±0,05)DIA. .250±.015(6,35±0,38) .250±.010(6,35±0,25)DIA. .060(1,52)REF. .084±.005(2,13±0,13)DIA. .050±.005 (1,27±0,13) Small Button Style 39-251* .100±.015(2,54±0,38) ENDOFBUTTONHASA.200(5,08)SPHERICALRADIUS .250±.010(6,35±0,25)DIA. .400±.015 (10,16±0,38) E .100±.010(2,54±0,25) .050±.005 (1,27±0,13)TYP. .100±.010(2,54±0,25) CL .300 ±.010 (7,62 ±0,25) .100–.005(2,54–0,13) N.C. N.O. XXXX .060(1,52)REF. .100±.015(2,54±0,38) .050±.005(1,27±0,13) .400±.015 (10,16±0,38) .340±.015 (8,64±0,38) .050±.005 (1,27±0,13)TYP. GRAYHILL .090 ±.010 (2,29 C L ±0,25) .340±.015 (8,64±0,38) .200±.015(5,08±0,38) .084±.005(2,13±0,13)DIA. .090 ±.010 (2,29 C ±0,25) L .100±.010 (2,54±0,25) CL .300 ±.010 (7,62 ±0,25) .100±.010 (2,54±0,25) E.I.A.DATE CODE Specifications CIRCUITRY Rating Criteria 2 Circuits Per Switch SPSt n.C. N.C. Actuator SPSt n.O. N.C. N.O. N.O. Contact Resistance: 25 milliohms maximum on a new switch Voltage Breakdown: 1,000 Vac between mutually insulated parts Insulation Resistance: 1,000 megohms minimum Operating Temperature: -40°C to +125°C ORDERING INFORMATION *Complete Part Number 39-251 RED 39-251 BLK 39-261 RED 39-261 BLK Description Small Red Button, SPDT Small Black Button, SPDT Large Red Button, SPDT Large Black Button, SPDT Materials and Finishes Alternate Wiring Actuator N.C. SPdt BreaK BeFOre C MaKe CONNECTPINS ONPCBOARD N.O. Button: Nylon Base and Cover: Polyester, red in color Shorting Bar: Phosphor bronze, gold-plated over nickel Terminals: Brass, gold-plated over nickel Spring: Tinned music wire O-Ring: Fluorosilicone Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com Pushbutton Switches Rating at 220 Vac Resistive Total Travel Action .125±.010(3,18±0,25) .068±.010(1,73±0,25) Rating at 115 Vac Resistive