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.