BENDER AC/DC sensitive residual current monitor RCMA475LY

BENDER AC/DC sensitive residual current monitor RCMA475LY

Product Overview

（1） Core positioning and applicable scenarios

Product Name: RCMA475LY AC/DC Sensitive Residual Current Monitor

Applicable systems: TN system, TT system (grounded power supply system)

Monitoring objects: alternating current (AC), direct current (DC), pulsating DC current

Typical applications: Scenarios with six pulse rectifiers or unidirectional rectification filtering loads, such as frequency converters, uninterruptible power supplies (UPS), battery chargers, construction site variable frequency drive equipment, etc

Core value: Identify continuous DC fault currents or residual currents greater than zero, and prevent electrical safety risks through warning and alarm mechanisms

（2） Compliance and Certification

Following standards: IEC/TR 60755 (Type B), EN 61543, EN 61000-6-4, IEC 60664-1 (Insulation Coordination), etc

Protection level: The shell material meets the UL94V-0 flame retardant standard

Core functions and operational features

（1） Monitoring and threshold setting

Specific parameter adjustability of functional items

Monitoring frequency range 0... 700Hz fixed

Alarm threshold (I Δ n1) 30... 500mA continuously adjustable

Warning threshold (I Δ n2) 50% I Δ n1 or 100% I Δ n1 DIP switch switching

Alarm response delay 0... 10s potentiometer adjustment (x1/x10 gear)

Warning response delayed by 0s or 1s DIP switch switching

（2） Key functions

Dual independent alarm relay: 2 conversion contacts, supporting NO (normally open)/NC (normally closed) operation mode switching (DIP switch setting), meeting different control circuit requirements.

Fault memory: The alarm status is automatically stored and needs to be manually cleared through the test/reset button for easy fault tracing.

Testing and Reset:

Built in: Combination button (short press<1s=reset, long press>2s=test).

External: Supports connecting external test/reset buttons (cable length is not explicitly limited and needs to be matched with the load).

Display function:

Power On LED: The device is constantly on during operation, but flashes when the measurement range exceeds the limit.

Alarm LED: It lights up when the alarm threshold is reached and flashes when the warning threshold is reached.

LED bar chart: displays the proportion of measured residual current to the set threshold at a scale of 0... 100%.

Detailed technical parameters

（1） Electrical parameters

Category specific specifications

Measurement current transformer built-in, inner diameter ø 18mm (PE conductor must not pass through)

Relative uncertainty of response value ≤ 25%

Lag characteristic ≤ 25% set response value (I Δ n)

Response time (at tv=0s) 1 times I Δ n1: ≤ 70ms; 5 times I Δ n1: ≤ 40ms

Relay parameter contact voltage: 150V AC/DC; Rated current: 5A (AC/DC); Connection capacity: 2A (AC 230V, cos φ=0.4); Breaking capacity: 0.2A (DC 220V, L/R=0.04s)

External measuring instrument interface current source output, 0... 400 µ A (corresponding to 0... 100% I Δ n), load ≤ 12.5k Ω

Supply voltage (by model) RCMA475LY: 230V AC/DC; RCMA475LY-13：90…132V AC/DC； RCMA475LY-21：9.6…84V AC/DC； RCMA475LY-23：77…286V AC/DC

Power consumption ≤ 3.5 VA

（2） Environmental and mechanical parameters

Category specific specifications

Working environment temperature -25...+70 ℃

Storage environment temperature -40...+75 ℃

Climate grade DIN IEC 60721-3-3 (3K5)

Impact resistance performance during operation: 15g/11ms (IEC 60068-2-27); During transportation: 40g/6ms (IEC 60068-2-29)

Vibration resistance performance during operation: 1g/10... 150Hz; During transportation: 2g/10... 150Hz (IEC 60068-2-6)

Installation method: Screw installation (hole diameter 4.3mm)

Shell weight ≤ 350g

The external dimensions refer to DIN 43871/IEC 60715 standard (specific dimensions: 99mm × 91mm × 45mm, subject to the actual product)

（3） Working characteristics of different current types

Current type Operating current range (relative to I Δ n) Remarks

AC current (50Hz) 0.5... 1 × I Δ n sine wave AC

Pulsating DC current (positive and negative half waves) 0.5... 1.4 × I Δ n with half wave rectified current

Phase controlled half wave current (delay angle 90 ° el/135 ° el) 0.5... 1.4 × I Δ n controllable rectifier load

Overlay 6mA smooth DC half wave current 0.5... 1.4 × I Δ n mixed DC+pulsating DC scene

Smooth DC current 0.5... 2 × I Δ n pure DC fault current

Model and ordering information

（1） Model differentiation and order number

Model, Supply Voltage, Applicable Scenarios, Order Number

RCMA475LY 230V AC/DC Industrial+Household B 9404 2002

RCMA475LY-13 90... 132V AC/DC Industrial B 9404 2004

RCMA475LY-21 9.6... 84V AC/DC Industrial B 9404 2014

RCMA475LY-23 77... 286V AC/DC Industrial B 9404 2015

Note: Other power supply voltage versions can be customized according to needs

（2） Recommended supporting components

Component Name Function Model Order Number

External measuring instrument 0... 100% residual current display (size 96 × 96mm) 9604-4241 B 986 807

Measurement converter input 0... 400 µ A, output 0... 10V/4... 20mA RK170 B 9804 1500

Installation and wiring points

The internal diameter of the built-in measuring current transformer is ø 18mm, and PE conductors are strictly prohibited from passing through the transformer to avoid measurement interference.

It is recommended to connect 6A fuses in series in the power supply circuit to ensure the safety of the equipment itself.

The external test/reset button and external measuring instrument need to be connected according to the wiring diagram to ensure stable signal transmission.

The installation location should meet the environmental temperature requirements and be away from heat sources and strong electromagnetic interference sources.