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 oered 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
① Insert the screwdriver into the respective operating slot.
② 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.
③ Insert the conductor into the oval connection slot.
④ 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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