Product data sheet RE8TA31BU Characteristics industrial timing relay - 0.3..30 s - type A - 24 V AC/DC, 110..240 V AC - 1 C/O Price* : 95.00 USD RE8TA31BU has not been replaced. Please contact your customer care center for more information. Discontinued Main Range of product Zelio Time Product or component type Optimum industrial timing relay Component name RE8 Time delay type A Time delay range 0.3...30 s Sale per indivisible quantity 1 Complementary Discrete output type Relay Contacts material Silver nickel contacts Width pitch dimension 0.89 in (22.5 mm) [Us] rated supply voltage 110...240 V ACat 50/60 Hz 24 V AC/DC at 50/60 Hz Voltage range 0.9...1.1 Us Connections - terminals Screw terminals 2 x 1.5 mm², flexible cable with cable end Screw terminals 2 x 2.5 mm², flexible cable without cable end Tightening torque 5.31...9.73 lbf.in (0.6...1.1 N.m) Setting accuracy of time delay +/- 20 % of full scale Repeat accuracy < 1 % Voltage drift < 2.5 %/V Temperature drift < 0.2 %/°C Minimum pulse duration 26 ms Reset time 50 ms Maximum switching voltage 250 V Mechanical durability 20000000 cycles [Ith] conventional free air thermal 8 A current [Ie] rated operational current <= 2 A at 24 V, DC-13 158 °F (70 °C) conforming to IEC 60947-5-1/1991 <= 2 A at 24 V, DC-13 158 °F (70 °C) conforming to VDE 0660 <= 3 A at 24 V, AC-15 158 °F (70 °C) conforming to IEC 60947-5-1/1991 <= 3 A at 24 V, AC-15 158 °F (70 °C) conforming to VDE 0660 <= 0.1 A at 250 V, DC-13 158 °F (70 °C) conforming to IEC 60947-5-1/1991 <= 0.1 A at 250 V, DC-13 158 °F (70 °C) conforming to VDE 0660 <= 0.2 A at 115 V, DC-13 158 °F (70 °C) conforming to IEC 60947-5-1/1991 Jun 24, 2018 1 Disclaimer: This documentation is not intended as a substitute for and is not to be used for determining suitability or reliability of these products for specific user applications <= 0.2 A at 115 V, DC-13 158 °F (70 °C) conforming to VDE 0660 Minimum switching capacity 10 mAat 12 V Marking CE Overvoltage category III conforming to IEC 60664-1 [Ui] rated insulation voltage 250 V conforming to IEC 300 V conforming to CSA Supply disconnection value > 0.1 Uc Operating position Any position without derating factor Surge withstand 2 kV conforming to IEC 61000-4-5 level 3 Power consumption in VA 0.7 VAat 24 V 1.8 VAat 110 V 8.5 VAat 240 V Power consumption in W 0.5 Wat 24 V Terminal description (15-16-18)OC_OFF ALT (A1-B1)CO Height 3.07 in (78 mm) Width 0.89 in (22.5 mm) Depth 3.15 in (80 mm) Product weight 0.24 lb(US) (0.11 kg) Environment Immunity to microbreaks 3 ms Standards EN/IEC 61812-1 Product certifications UL GL CSA Ambient air temperature for storage -40...185 °F (-40...85 °C) Ambient air temperature for operation -4...140 °F (-20...60 °C) Relative humidity 15...85 % 3K3 conforming to IEC 60721-3-3 Vibration resistance 0.35 mm 10...55 Hz conforming to IEC 60068-2-6 IP degree of protection IP20 (terminals) IP50 (casing) Pollution degree 3 conforming to IEC 60664-1 Dielectric test voltage 2.5 kV Non-dissipating shock wave 4.8 kV Resistance to electromagnetic fields 9.14 V/yd (10 V/m) conforming to IEC 61000-4-3 level 3 Resistance to fast transients 2 kV conforming to IEC 61000-4-4 level 3 Disturbance radiated/conducted CISPR 22 - class A CISPR 11 group 1 - class A Ordering and shipping details Category 22376 - RELAYS-MEASUREMENT(RM4) Discount Schedule CP2 GTIN 00785901515326 Nbr. of units in pkg. 1 Package weight(Lbs) 0.23999999999999999 Returnability N Country of origin ID Contractual warranty Warranty period 18 months 2 Product data sheet RE8TA31BU Dimensions Drawings Width 22.5 mm Rail Mounting Screw Fixing 3 Product data sheet RE8TA31BU Connections and Schema Internal Wiring Diagram 4 Product data sheet RE8TA31BU Connections and Schema Recommended Application Wiring Diagram 5 Product data sheet RE8TA31BU Performance Curves Performance Curves A.C. Load Curve 1 Electrical durability of contacts on resistive loading millions of operating cycles X Current broken in A Y Millions of operating cycles A.C. Load Curve 2 Reduction factor k for inductive loads (applies to values taken from durability curve 1). X Power factor on breaking (cos ϕ) Y Reduction factor k Example: An LC1-F185 contactor supplied with 115 V/50 Hz for a consumption of 55 VA or a current consumption equal to 0.1 A and cos ϕ = 0.3. For 0.1 A, curve 1 indicates a durability of approximately 1.5 million operating cycles. As the load is inductive, it is necessary to apply a 6 reduction coefficient k to this number of cycles as indicated by curve 2. For cos ϕ = 0.3: k = 0.6 The electrical durability therefore becomes:1.5 10 operating cycles x 0.6 = 900 000 operating cycles. 6 D. C. Load Limit Curve X Current in A Y Voltage in V 1 L/R = 20 ms 2 L/R with load protection diode 3 Resistive load 7 Product data sheet RE8TA31BU Technical Description Function A : Power on Delay Relay Description The timing period T begins on energisation. After timing, the output(s) R close(s). The second output can be either timed or instantaneous. Function: 1 Output Function: 2 Outputs 2 timed outputs (R1/R2) or 1 timed output (R1) and 1 instantaneous output (R2 inst.) 8 Product data sheet RE8TA31BU Technical Description Legend Relay de-energised Relay energised Output open Output closed C Control contact G Gate R Relay or solid state output R1/R2 2 timed outputs R2 inst.The second output is instantaneous if the right position is selected T Timing period Ta - Adjustable On-delay Tr - Adjustable Off-delay U Supply 9