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ETR 46 - SafetySwitch

ETR 46 - SafetySwitch

Product description

The ETR 46 - Safety Switch provides ideal protection for Sylvania air heaters of the SureHeat series.

To avoid thermal damage, the ETR 46 - Safety Switch executes a high-speed disconnection of the air heater and can additionally signalise this disconnection to the temperature controller to stop the control algorithm.

The ETR 46 - Safety Switch monitors the measured value of SureHeat thermo sensor S1.  When the set temperature limit is reached, a disconnect of the air heater occurs in the range of <100 ms.

All digital outputs of the ETR 46 - Safety Switch are pre-configured and signal an exceeding of the temperature limit through a LOW signal (Fail-Safe, also during power interruption).

Product information

Technical specifications

General Data

Number of control zones1
Rated voltage85-240VAC | 24VDC
Power consumption150mA
Fuse protection1 A MT
Displays2 four-digit 7 segment LED
Operating elementsMembrane keypad
Status displayLEDs
Dimensions(HxWxD in mm) 96 x 48 x 94
MountingFront panel
Weight0.2 kg
Operating temperature0...55 °C
ConnectionsClamping integrated in housing
Ingress protectionFront side IP 54; housing, connections IP20
Addressing modeBy configuration parameters
StandardsCE, EN 61010, EN 61326
Data backupPower failure safe in EEPROM

Data interfaces

RS485Option; protocols: PSGII, Modbus RTU | Baud rate: 1200 - 19200 baud
CANOption; protocols: CAN Bus Standard (2.0A), Canopen (Profiles CiA 401 V2.01) | Baud rate: up to 1 Mbps

Temperature measuring inputs

Resolution14 Bit
TypeThermocouple type J,K,L | resistance thermometer Pt100
Range-50...1200°C, 0...850°C | -50...1200°C
Reference junctionInternal
Input resistance> 47 kOhm
Measuring precision< 1 K
MonitoringSensor break, sensor polarity reversal, sensor short-circuit

Heating current measuring inputs

Quantity1, single-phase, via current transformer
Measuring signal42 mV/A
Resolution14 Bit

Digital inputs

Quantity2 | (Option) 2
Electrical dataActivation through external potential free contact | 0-30 VDC, < 10 mA for 24 VDC
FunctionFunction adjustable

Digital outputs

Quantity4 | (Option) 2
Type1 electronic switching contact; 3 relay output | 2 x optical coupler
Electrical data60 V, 100 mA; 250 V, 2 A ohmic load | 0-30 VDC, up to 500 mA for external power supply, short-circuit proof
FunctionControl outputs, alarm outputs

Analogue inputs

Quantity(Option) 2
TypeU (0...10 VDC resp. 2...10 VDC) | I (0...20 mA resp. 4...20 mA)
Resolution8 Bit
MonitoringLine break
FunctionFunction adjustable


In the Media & Downloads section you will find an overview of all product-specific documents. 
For technical data like e.g: User guides, service manuals, etc. please register.

To media & downloads


USB converter - RS 422/485
Configuration and project setup

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