KFD-SR2-EX2.W ISOLATING SWITCH AMPLIFIER

Product parameters

Power supply: Rated voltage 20... 30 V DC (powered by Power Rail or terminal), power dissipation 1.3 W, maximum power consumption ≤ 1 W, rated current 50 mA, ripple ≤ 50 µA rms.

Input (on-site side) : Connect terminals 1+ and 2-; 4+, 5-, input type dry contact or NAMUR (8 V DC, 8 mA), load ≥ 100 kΩ, response time < 10 ms.

Output (control side) : Connect terminals 7, 8, 9; 10, 11, 12, output type relay contact (Form C conversion contact), switching capacity 253 VAC / 40 VDC, 2A / 4A, mechanical life 10^7 times, electrical life 10^5 times, response time < 10 ms.

Performance indicators: Switching frequency up to 1 kHz, isolation voltage 375 V (peak), high precision, LFD detects open circuit/short circuit faults, and LED indicates the fault status.

Isolation and Safety: The input/output and input/power supply are intrinsically safe isolated (peak voltage 375V), the output/power supply is functionally isolated (50V AC), the protection class is IP20, in compliance with SIL 2 (IEC/EN 61508), and the electromagnetic compatibility complies with EN 61326-1:2013.

Certifications: CE, ATEX (II (1)G [Ex ia Ga] IIC, etc.), IECEx, cULus, explosion parameters Uo = 10 V, Io = 20 mA, Po = 0.1 W, Um = 250 V.

Mechanical parameters: Dimensions 20 x 124 x 115 mm, weight approximately 150 g, installed on 35 mm DIN rail, screw terminal connection, ambient temperature -20... 60 °C.

Function

Isolate and convert the NAMUR sensor or dry contact digital signal in the hazardous area into a relay output for the safe area, supporting independent operation of 2 channels.

Supports line fault detection (LFD), automatically identifies open circuits or short circuits, and displays them through LED indicator lights for convenient fault diagnosis.

Reversible operation mode, allowing the input signal to reverse the output logic, compatible with Form C relay contacts, used to control loads such as solenoid valves or alarms.

Intrinsically safe design, compliant with SIL 2 standard, fast response (< 10 ms), supports Power Rail system integration.

Equipped with test point terminals, it is easy to install and maintain, and is suitable for switch signal amplification and isolation transmission.

Application scenarios

KFD2-SR2-Ex2.W is widely used in process automation in industries such as petrochemicals, pharmaceuticals, mining and oil refining, and is suitable for explosive hazard areas in Zone 0/1/2 or Div.1/2. It is used to isolate NAMUR proximity sensors or switch signals to ensure that the control system in the safe area (such as PLC or DCS) reliably receives digital input, while supporting fault detection and relay output control of actuators or alarms. The equipment complies with ATEX, IECEx and cULus certifications, and is suitable for industrial monitoring and automation systems that require high safety and switch accuracy.

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