BENDER WR70x175S (P)... WR200x500S (P) rectangular measuring current transformer

BENDER WR70x175S (P)... WR200x500S (P) rectangular measuring current transformer

Product Overview

（1） Core positioning and adaptation scenarios

Product Name WR70x175S (P)... WR200x500S (P) Rectangular Measuring Current Transformer

Core application: 1. Cooperate with residual current monitoring systems such as RCMS460/490 and RCM420 to convert AC current into assessable signals;

2. Cooperate with insulation fault location systems such as EDS470/460/490/440 (IT system) to collect positioning currents generated by PGH positioning current injectors or IRDH series insulation monitoring instruments

Suitable for industrial electrical systems and busbar systems, the SP series is particularly suitable for scenarios with load currents ≥ 500A, which can avoid false triggering caused by high load currents or surge currents

（2） Compliance and Certification

Following standards: DIN EN 60044-1 (General Standard for Current Transformers), IEC 61869 (Standard for Power Transformers)

Safety level: The flame retardant rating of the shell is UL94 V-0, the protection level of the internal components is IP40, and the protection level of the terminals is IP20

Product Classification and Core Features

（1） Series classification

Examples of applicable scenario models for the core features of the series

S series without integrated shielding for conventional load current scenarios WR70x175S, WR200x500S

SP series with integrated shielded busbar system, load current ≥ 500A scenario, anti misoperation WR115x305SP, WR150x350SP

（2） Core functions and advantages

Signal conversion: Fixed 600:1 rated transformation ratio, converts the primary side current (≥ 10mA) into a secondary side assessable signal, providing accurate data for monitoring/positioning systems.

Overvoltage protection: The secondary side is equipped with a suppression diode (P6KE6V8CP) to ensure equipment safety.

Flexible installation: Supports installation at any position, and wire connections are compatible with multiple specifications (rigid/flexible conductors).

Anti interference design: The integrated shielding of the SP series can resist the interference of high load current and surge current, avoiding false triggering of connected devices.

Key technical parameters

（1） Electrical parameters

Maximum system voltage AC 720 V

Rated impulse withstand voltage 3 kV

Rated transformation ratio 600/1

Rated load 180 Ω

Rated primary current ≤ 10 A (100 A), minimum ≥ 10 mA

Rated nominal power 50 mVA

Rated frequency 50... 400 Hz

Internal resistance 5... 8 Ω

Accuracy level 5

Rated continuous thermal current of 100 A

Rated short-time thermoelectric current 14 kA/1 s

Rated dynamic current 35 kA/30 ms

（2） Environmental and mechanical parameters

Category specific specifications

Working environment temperature -10...+50 ℃

Storage environment temperature -40...+70 ℃

Climate grade DIN IEC 60721-3-3 (3K22)

Impact resistance performance during operation at 15 g/11 ms (IEC 60068-2-27)

Vibration resistance performance during operation at 1 g/10... 150 Hz (IEC 60068-2-6)

Protection level: Internal components IP40, terminals IP20

Install and fix M5 screw installation

Shell material flame retardant grade UL94 V-0

（3） Size and weight

Model Internal dimensions (A × B, mm) Weight

WR70x175S(P) 70×175 2200 g

WR115x305S(P) 115×305 4500 g

WR150x350S(P) 150×350 5900 g

WR200x500S(P) 200×500 11500 g

（4） Connection parameters

Connection type specification requirements

Terminal type: screw terminal

Conductor adaptation rigidity 0.2... 4mm ², flexibility 0.2... 2.5mm ², flexible conductor with/without plastic collar 0.25... 2.5mm ² (AWG 24... 12)

The cable requires a single core wire of ≥ 0.75mm ² (0... 1m); Stranded single core wire ≥ 0.75mm ² (0... 10m); Shielded cable ≥ 0.6mm ² (0... 40m), recommended J-Y (St) Y 2 × 0.6mm ² (shielding layer single end connected to PE)

Installation and usage specifications

（1） Core installation requirements

Prohibited conductors to pass through: shielded cables, PE conductors, and low resistance conductor circuits to avoid affecting measurement accuracy.

Wire direction and position: The wire needs to enter from the P1 (K, yellow identification) side and exit from the P2 (L, gray identification) side, and all current carrying wires need to pass through the transformer; The wire should be aligned with the center of the transformer, and the bending radius should follow the manufacturer's specifications. The 90 ° bending distance should not be less than twice the height of the transformer.

Installation position: It can be installed in any direction to ensure a firm and secure fixation without looseness.

（2） Wiring precautions

Shielded cables need to be grounded at one end (connected to PE), with a maximum connection distance of 40m. If the distance exceeds 40m, compliant shielded cables must be used to ensure signal transmission.

The wiring terminals need to be tightened to avoid signal distortion caused by poor contact.

Order Information

Model Internal dimensions (mm) Shielding characteristics Order number

WR70x175S 70 × 175 without B911738

WR115x305S 115 × 305 without B911739

WR150x350S 150 × 350 without B911740

WR200x500S 200 × 500 without B911763

WR70x175SP 70 × 175 integrated shielding B911790