Product Description

GESTRA NRS1-50 Level Switch

The GESTRA NRS1-50 is a compact level switch designed for use with GESTRA level electrodes (such as NRG 1x-50, NRG 1x-51, NRG 1x-11, NRG 1x-12) to signal MIN or MAX water levels in steam boilers, tanks (feedwater, condensate), and other vessels containing conductive liquids. It operates based on the conductive measurement principle, providing a reliable switching output when the liquid level reaches the electrode tip. This switch is commonly used for limit signalling and water level control applications.

Technical Specifications:

Supply Voltage Options: 24 V DC; 24 V AC, 50/60 Hz; 115 V AC, 50/60 Hz; 230 V AC, 50/60 Hz
Power Consumption: Approx. 3 VA / 1.5 W
Sensitivity (Standard): 10 µS/cm at 25°C (for boiler applications)
Output: 1 potential-free change-over contact
Switching Point: Defined by the length of the connected level electrode
Contact Rating (AC): Max. 250 V, 4 A, 500 VA cos φ = 0.7
Contact Rating (DC): Max. 300 V, 0.2 A, 60 W (L/R = 0 ms)
Ambient Temperature: 0 °C to +55 °C (Operating)
Housing Protection: IP40
Terminal Protection: IP20
Mounting: DIN rail EN 60715
Approvals: TÜV tested for boiler applications (meets requirements acc. to EN 12952-11 and EN 12953-9), SIL 2 (acc. to IEC 61508)