Excerpt from the technical data sheet: Technical characteristics of the KFU8-SR-Ex1.W.LB
| Main Features | ||
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| Signal type | Digital input | |
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Parameters related to functional safety |
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| Safety Integrity Level (SIL) | SIL 2 | |
| Systematic ability (SC) | SC 3 | |
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Supply |
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| Connection | terminals 14, 15 | |
| Nominal voltage | 19 ... 30 VDC / 90 ... 253 VAC 50 ... 60 Hz | |
| Power dissipation/power consumption | ≤ 1.2 W / ≤ 1.2 W; 3.4 VA | |
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Entrance |
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| Connection side | side of the field | |
| Connection | terminals 1+, 2+, 3- | |
| Nominal values | according to EN 60947-5-6 (NAMUR) | |
| Open circuit voltage/short circuit current | approx. 8 VDC / approx. 8 mA | |
| Switching point/switching hysteresis | 1.2 ... 2.1 mA / approx. 0.2 mA | |
| Line fault detection | open circuit I ≤ 0.1 mA, short circuit I > 6 mA | |
| Pulse/pause ratio | min. 20 ms/min. 20 ms | |
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Exit |
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| Connection side | control side | |
| Connection | output I: terminals 7, 8, 9; output II: terminals 10, 11, 12 | |
| Exit I | signal; relay | |
| Exit II | fault signal or message; relay | |
| Contact loading | 250VAC/2A/cos φ>0.75; 126.5VAC/4A/cos φ>0.75; 40VDC/2A resistive load | |
| Minimum switching current | 2 mA / 24 V DC current | |
| On/Off Delay | OK. 20ms / approx. 20 ms | |
| Mechanical life | 10 7 switching cycles | |
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Transmission characteristics |
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| Switching frequency | ≤ 10 Hz | |
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Galvanic isolation |
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| Input, output | reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V eff. | |
| Input/Power | reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V eff. | |
| Output/Power | reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V eff. | |
| Exit/Exit | reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 V eff. | |
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Indicators/settings |
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| Display elements | LEDs | |
| Controls | DIP switch | |
| Configuration | via DIP switches | |
| Marking | marking space at the front | |
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Compliance with the directive |
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| Electromagnetic compatibility |
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Directive 2014/30/EU | EN 61326-1:2013 (industrial premises) |
| Low voltage |
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Directive 2014/35/EU | EN 61010-1:2010+A1:2019+A1:2019/AC:2019 |
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Correspondence |
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| Electromagnetic compatibility | NE 21:2017, EN 61326-3-1:2017, EN IEC 61326-3-2:2018, EN IEC 61326-1:2021 (industrial areas) | |
| Degree of protection | IEC 60529:1989+A1:1999+A2:2013 | |
| Entrance | EN 60947-5-6:2000 | |
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Environmental conditions |
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| Ambient temperature |
-40 ... 60 °C (-40 ... 140 °F) Extended ambient temperature range up to 70°C (158°F), see manual for installation requirements |
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Mechanical characteristics |
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| Degree of protection | IP20 | |
| Connection | screw terminals | |
| weight | approx. 150 g | |
| Dimensions | 20 x 119 x 115 mm (0.8 x 4.7 x 4.5 in) (W x H x D), case type B2 | |
| Installation | on a 35 mm DIN rail in accordance with EN 60715:2001 | |
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Data for use in hazardous areas |
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| EU Type Examination Certificate | FIDI 22 ATEX 0029 X | |
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Marking |
 II 3(1)G Ex ec nC [ia Ga] IIC T4 Gc II (1)D [Ex ia Da] IIIC I (M1) [Ex ia Ma] I
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Entrance | Ex iа |
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Voltage | 10.5 V |
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Current | 13 mA |
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Power | 34 mW (linear characteristic) |
| Supply |
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Maximum safe voltage | 253 V AC (Note: U m is not the nominal voltage.) |
| Exit |
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Maximum safe voltage | 253 VAC (Caution: Nominal voltage may be lower.) |
| Galvanic isolation |
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Input, output | safe electrical insulation in accordance with IEC/EN 60079-11, peak voltage 375 V |
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Input/Power | safe electrical insulation in accordance with IEC/EN 60079-11, peak voltage 375 V |
| Compliance with the directive |
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Directive 2014/34/EU |
EN IEC 60079-0:2018, EN 60079-7:2015+A1:2018, EN 60079-11:2012, EN IEC 60079-15:2019 |
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International certificates |
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| UL approval | E106378 | |
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Control drawing | 116-0489 |
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Contact loading | 250VAC/2A/cos φ>0.75; 126.5VAC/4A/cos φ>0.75; 30VDC/2A resistive load |
| IECEx certification |
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IECEx Certificate | IECEx FIDI 22.0003X |
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IECEx marking | Ex ec nC [ia Ga] IIC T4 Gc , [Ex ia Da] IIIC , [Ex ia Ma] I |