The contact pressure between the conductor and the busbar is set to an optimum level, so this
clamp connection is appropriate for high-voltage applications, as well as for transferring
voltages and currents in the mV or mA range within instrumentation and electronic
components.
A standardized screwdriver (3 mm slot; 3RA2908-1A) is o󹪜ered in the Catalog IC10 "Industrial
Controls" (https://support.industry.siemens.com/cs/de/de/view/109747945/en) as an
actuation tool for opening the spring-loaded terminals.
Spring-loaded terminal for mountable 3RR2 current monitoring relays
The table below describes the procedure for creating a spring-loaded connection:
DANGER
Hazardous Voltage.
Will cause death or serious injury.
Turn o󹪜 and lock out all power supplying this device before working on this device.
Connecting the 3RR2 current monitoring relay spring-loaded terminal
â‘ Insert the screwdriver into the respective operating slot.
â‘¡ Press the screwdriver down, then push it into the operating slot as far as it will go.
The screwdriver blade keeps the spring-loaded terminal open automatically.
â‘¢ Insert the conductor into the oval connection slot.
â‘£ Remove the screwdriver. The terminal closes and the conductor is now securely clamped.
System overview
3.3 Connection methods
SIRIUS 3UG4 / 3RR2 monitoring relay
26 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
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