RE8RA31BTQ

Product data sheet Characteristics 

RE8RA31BTQ industrial timing relay - 0.3..30 s - type C - 24 V AC/DC - 1 C/O 

## Main 

|Main||
|---|---|
|Range of product|Zelio Time|
|Product or component|Optimum industrial timing relay|
|type||
|Component name|RE8|
|Time delay type|C|
|Time delay range|0.3...30 s|
|[Us] rated supply|24 V AC/DC, 50/60 Hz|
|voltage||
|Sale per indivisible|10|
|quantity||



|Complementary<br>Discrete output type<br>Contacts material<br>Width pitch dimension<br>Voltage range<br>Connections - terminals<br>Tightening torque<br>Setting accuracy of time delay<br>Repeat accuracy<br>Voltage drift<br>Temperature drift<br>Minimum pulse duration<br>Reset time<br>Maximum switching voltage<br>Mechanical durability<br>[Ith] conventional free air thermal current<br>[Ie] rated operational current<br>Minimum switching capacity<br>Input voltage<br>Maximum switching current<br>Input compatibility<br>Marking<br>Overvoltage category<br>[Ui] rated insulation voltage<br>Supply disconnection value<br>Operating position<br>Surge withstand<br>Power consumption in VA<br>Power consumption in W|Relay<br>90/10 silver nickel contacts<br>22.5 mm<br>0.9...1.1 Us<br>Screw terminals 2 x 1.5 mm², flexible cablewith cable end<br>Screw terminals 2 x 2.5 mm², flexible cablewithout cable end<br>0.6...1.1 N.m<br>+/- 20 % of full scale<br>< 1 %<br>< 2.5 %/V<br>< 0.2 %/°C<br>26 ms<br>50 ms<br>250 V<br>20000000 cycles<br>8 A<br><= 2 A at 24 V, DC-13 for 70 °C conforming to IEC 60947-5-1/1991<br><= 2 A at 24 V, DC-13 for 70 °C conforming to VDE 0660<br><= 3 A at 24 V, AC-15 for 70 °C conforming to IEC 60947-5-1/1991<br><= 3 A at 24 V, AC-15 for 70 °C conforming to VDE 0660<br><= 0.1 A at 250 V, DC-13 for 70 °C conforming to IEC 60947-5-1/1991<br><= 0.1 A at 250 V, DC-13 for 70 °C conforming to VDE 0660<br><= 0.2 A at 115 V, DC-13 for 70 °C conforming to IEC 60947-5-1/1991<br><= 0.2 A at 115 V, DC-13 for 70 °C conforming to VDE 0660<br>10 mA at 12 V<br>24 V (Y1)<br>10 mA (Y1)<br>2-wire sensors DC with leakage current < 1 mA, cable length: <= 50 m (Y1)<br>CE<br>III conforming to IEC 60664-1<br>250 V conforming to IEC<br>300 V conforming to CSA<br>> 0.1 Uc<br>Any position without derating factor<br>2 kV conforming to IEC 61000-4-5 level 3<br>0.7 VA at 24 V<br>0.5 W at 24 V|
|---|---|



7/9/2011 

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|Terminal description|(15-16-18)OC_ON|
|---|---|
||(A1-A2)CO|
||(Y1)UNUSED|
|Height|78 mm|
|Width|22.5 mm|
|Depth|80 mm|
|Product weight|0.11 kg|
|Environment||
|Immunity to microbreaks|3 ms|
|Standards|EN/IEC 61812-1|
|Product certifications|CSA|
||GL|
||UL|
|Ambient air temperature for storage|-40...85 °C|
|Ambient air temperature for operation|-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|
|Shock resistance|15 gn (duration = 11 ms conforming to IEC 60068-2-27|
|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 electrostatic discharge|6 kV in contact conforming to IEC 61000-4-2 level 3|
||8 kV in air conforming to IEC 61000-4-2 level 3|
|Resistance to electromagnetic fields|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|CISPR11 group 1- class A|
||CISPR22 - class A|
|RoHS EUR status|Compliant|
|RoHS EUR conformity date|0624|



2 

Product data sheet Technical Description 

## RE8RA31BTQ 

## Function C: Timing After Opening of Control Contact 

## Description 

After power-up and closing of the control contact C, the output R closes. When control contact C re-opens, timing T starts. At the end of the timing period, the output(s) R revert(s) to its/their initial state. 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.) 

## Legend 

Relay de-energised Relay energised Output open Output closed 

C Control contact G Gate R Relay or solid state output 

R1/ 2 timed outputs R2 

R2 The second output is instantaneous if the right position is selected inst. 

T Timing period Ta Adjustable On-delay 

Tr Adjustable Off-delay 

U Supply 

3 

Product data sheet Dimensions Drawings 

## RE8RA31BTQ 

Width 22.5 mm 

## Rail Mounting 

## Screw Fixing 

4 

## Product data sheet 

## RE8RA31BTQ 

## Connections and Schema 

## Internal Wiring Diagram 

## Recommended Application Wiring Diagram 

## Control of Several Relays 

Control of several relays with a single external control contact 

The external control contact C may be an electronic control device, for example a true-wire sensor. In this case A1-A2= 24 Vdc and the control device can only control-up to a maximum of 4 relays. 

## Connection of a 2-Wire Sensor 

Leakage current (open state) if < 1 mA. 

5 

Product data sheet Performance Curves 

## RE8RA31BTQ 

## 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 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[6] operating cycles x 0.6 = 900 000 operating cycles. 

## 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 

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