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"After ordering an urgent part from Marvo i received a great level of customer service and Rob was very helpful."
The Pepperl + Fuchs WE 77/EX-1 is a high-quality switch amplifier designed to facilitate the safe and efficient transfer of digital signals from hazardous to non-hazardous areas. This device is particularly suitable for use in control and instrumentation technology, where it provides galvanic isolation for standard signals such as 20 mA and 10 V, or for adapting and standardising signals.
Constructed for durability and reliability, the WE 77/EX-1 is compatible with a 230V AC supply voltage and features a single relay output with one changeover contact. It supports a reversible mode of operation and includes lead breakage (LB) monitoring to ensure the integrity of connections.
The switch amplifier is designed for mounting on a 35 mm DIN mounting rail in accordance with EN 60715, ensuring easy integration into existing systems. It boasts an IP20 protection degree, safeguarding against solid objects larger than 12.5 mm but not against water, making it suitable for controlled environments.
With a robust operating temperature range of -25 to 60°C, the WE 77/EX-1 can withstand challenging industrial environments. Its compact dimensions and approximate weight of 390 g make it an unobtrusive addition to any setup.
The device is certified with an ATEX marking of II (1)GD [EEx ia] IIC for circuits in zone 0/1/2, indicating its suitability for use in explosive atmospheres. It also complies with the relevant EMC and low voltage directives, ensuring it meets the stringent standards required for industrial equipment in the European market.
The Pepperl + Fuchs WE 77/EX-1 switch amplifier is an essential component for professionals seeking to maintain signal integrity and safety in industrial applications involving hazardous areas.
| Specification | Description |
|---|---|
| Part Number | WE 77/EX-1 |
| Alternative Part Number | WE77Ex1 |
| Manufacturer | Pepperl + Fuchs |
| Supply Voltage | 198 ... 253 V AC; 45 ... 65 Hz |
| Power Loss | 1.6 W |
| Power Consumption | Approx. 2.3 VA |
| Input Connection | Terminals 1-, 2+ |
| Rated Values | Acc. to EN 60947-5-6 (NAMUR) |
| Open Circuit Voltage | Approx. 8 V DC |
| Short-Circuit Current | Approx. 8 mA |
| Switching Point/Hysteresis | 1.2 ... 2.1 mA / approx. 0.2 mA |
| Pulse/Pause Ratio | ≥ 0.5 ms / ≥ 0.5 ms |
| Lead Monitoring Breakage | I ≤ 0.1 mA |
| Output Connection | Terminals 7, 8, 9 |
| Output Signal | Relay |
| Contact Loading | 253 V AC/2 A/500 VA/cos φ min. 0.7; 125 V AC/4 A/500 VA cos φ min. 0.7; 40 V DC/2 A/80 W ohmic load |
| Energised/De-energised Delay | Approx. 10 ms / approx. 20 ms |
| Mechanical Life | 10^7 switching cycles |
| Switching Frequency | < 10 Hz |
| Electrical Isolation | Output/power supply basic insulation according to IEC 61140, rated insulation voltage 300 Veff |
| Ambient Temperature | -25 ... 60 °C (-13 ... 140 °F) |
| Protection Degree | IP20 |
| Dimensions | 40 x 104 x 110 mm (1.6 x 4.1 x 4.3 in) |
| Mass | Approx. 390 g |
| EC-Type Examination Certificate | PTB 02 ATEX 2065 |
| Type of Protection | ¬ II (1)GD [EEx ia] IIC [circuit(s) in zone 0/1/2] |
Thumbs up to Rob for helping out with an urgent requirement we had on a Friday afternoon. The part we wanted was over in Europe and Rob went out of his way to get it ordered and on site here for the following Tuesday.City Bearings
Absolutely fantastic service. Rob was very helpful. Great communication. Requested part was shipped in no time.Konrad Eliaszuk
Found the component i was looking for ad a great price. Great support from the staff as I was paying using a wire transfer. - Quick delivery and very good packaging.Adriano Tiberi
Found the part we needed at the best price. Spoke to Rob to make sure the part was actually in stock, as many companies don't actually have the part available to ship. It was in stock ready and the part was checked and shipped and received within a couple of days from their German stock. Would definitely use again and recommend.Chris Sentance
FIRST TIME WORKING WITH MARVO. THEY HAD WHAT I NEEDED AND TOOK GREAT CARE OF ME AND GOT MY ORDER OUT IMMEDITELY. WAS VERY IMPRESSED WITH THE SERVICE AND THE PERSON I SPOKE WITH. I WILL DEFINITELY WORK WITH THEM QGAIN IN THE FUTURE.Robert Cohen
After ordering an urgent part from Marvo i received a great level of customer service and Rob was very helpful.Claire Hinchliff
Found the component i was looking for ad a great price. Great support from the staff as I was paying using a wire transfer. - Quick delivery and very good packaging.Adriano Tiberi
Found the part we needed at the best price. Spoke to Rob to make sure the part was actually in stock, as many companies don't actually have the part available to ship. It was in stock ready and the part was checked and shipped and received within a couple of days from their German stock. Would definitely use again and recommend.Chris Sentance
FIRST TIME WORKING WITH MARVO. THEY HAD WHAT I NEEDED AND TOOK GREAT CARE OF ME AND GOT MY ORDER OUT IMMEDITELY. WAS VERY IMPRESSED WITH THE SERVICE AND THE PERSON I SPOKE WITH. I WILL DEFINITELY WORK WITH THEM QGAIN IN THE FUTURE.Robert Cohen
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