Dossena Residual current Relay Type B NA-C-NC 0.03A to 30A 3M 9DER4B/2D
DOS 9DER4B/2D
9000015355608
Dossena Residual current Relay is an advanced type B electrical protection device, designed for systems with innovative loads (inverters, UPS, charging stations, medical equipment), ensures high selectivity and leakage control in alternating, direct and mixed current, with the following features:
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Type: type B residual current relay, 3 DIN modules
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Threshold current: 0.03A to 30A
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Tripping delay: 0.06s to 30s + instantaneous mode
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Display: Matrix LCD, changes color (Green/Blue/Red) according to status
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Dual threshold: Alarm (ALARM) + Tripping (TRIP)
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Outputs: 2 NO-C-NC contacts
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Self diagnostics: Opening coil and transducer TB
€627.13
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Dossena Residual current Relay for modern systems
The DER4B/2D is ideal for installations where continuous or mixed leakage currents converge, such as elevators, photovoltaic systems, electric vehicles, and industrial equipment, where conventional A-type relays are not sufficient. Separate TB toroid technology and customizable calibration make protection precise, flexible, and user friendly.
Easy installation and configuration
The device mounts on DIN rail (3 modules) and requires auxiliary power supply of 48/400V AC/DC. TB toroid wiring should be via twisted and shielded cable with <0.5 resistance. LCD display facilitates programming and visual diagnostics. Test, calibration, reset, and automatic reset can be controlled directly from the panel.
Safety and regulatory compliance
The DER4B meets the IEC 60947-2:2019 standard, ensuring maximum reliability. The device is equipped with a coil and transducer self-test function, signaling any anomalies. The components meet protection requirements (IP40 panel, IP20 terminals), V0 insulation, CATIII overvoltage category and pollution degree 2.
Typical Applications
Suitable for differential protection in tertiary/industrial environments where complex electronic devices generating contaminated currents are present (UPS, solar inverters, traction, medical). Ideal for ensuring business continuity and safety, even in advanced domestic networks.
Technical Specifications Residual current Relay DER4B
Power Supply and Installation
| Auxiliary power supply | 48-400V AC ±15% (50/60Hz) |
| Maximum power consumption | ≤4VA |
| Mounting | DIN rail (3 modules) |
| Maximum usage altitude | 2000m |
Standards and Safety
| Overvoltage category | CAT II (auxiliary power supply), CAT III (controlled circuit) |
| Pollution degree | 2 |
| Reference Standards | IEC 60947-2 |
| Insulation class | II (front) |
| Enclosure self-extinguishing class | V0 |
Controlled Circuit
| Rated voltage | <1000V AC / <1500V DC |
| Distribution system | TT, TN |
| Allowable short-circuit current (Icw) | 80kA for 0.5s |
| Measurement type | TRMS |
Adjustments and Features
| Adjustment range IΔn | T35 / T60 / T80: 0.03-12A T110: 0.1-16A T160 / T210: 0.3-30A |
| Adjustable tripping delay (Δt) | Instantaneous / 0.06-30s |
| Adjustable display contrast | 0 to 20 |
Outputs and Interfaces
| Output contacts | 2 NO-C-NC relays (TRIP and ALARM) |
| NO relays | 250V AC 5A PF1 / 30V DC 5A |
| NC relay | 250V AC 3A PF1 / 30V DC 3A |
| Interfaces (optional) | RS485 Modbus RTU (DER4B/2DRS485) Ethernet Modbus TCP/IP (DER4B/2DETH) |
| Galvanic isolation serial interface | <1kV @50Hz |
Connections and Environmental Conditions
| Toroid connection | Shielded twisted cables ≥0.5mm² |
| Degree of protection | IP40 (front panel), IP20 (terminals) |
| Operating temperature range | -10°C TO +55°C |
| Storage temperature | -20°C ÷ +80°C |
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Data sheet
- Type: Residual current relays
- Voltage: 400VAC
- Amps: 0.03-30A
