Interface Codes
                   Printable Datasheet PDF
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With nominal 3 phase line voltage applied, a flashing green NORMAL LED gives positive indication of a good fuse and integrity of the wire connection to each side of the fuse.1

A flashing red FAULT LED gives positive indication of an unconnected or open fuse, or a R-3FS wiring fault that needs corrected such as a lost connection to either side of the fuse or mismatched line and load wires.2

When phase loss occurs, both FAULT and NORMAL LED's will extinguish.3 The R-3FS will continue to indicate the status of the fuse during a phase loss if a regenerated voltage is produced on the open phase from a rotating motor.4
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NFPA 70E Compliant
NFPA 70E Compliant
High Visibility LED’s Display ‘Normal’ and ‘Open’ Fuse State.
External Standard ½” Conduit Hole Mounting.
Pre-wired leads for Reliable Connection.
Universal Voltage Input 208-600VAC.
For All Fuse UL Class H, K, R, RK
Seeing Fuses
                      Before Opening your Panel
CAUTION: The R-3FS should not be confused with the R-3W Power Warning Alert.  The R-3FS is designed to detect blown fuses and not voltage potentials from Phase-to-Ground or Phase-to-Phase above 40 VAC.  DANGEROUS VOLTAGE POTENTIALS CAN STILL EXIST WITHIN THE PANEL EVEN THOUGH THE R-3FS HAS NO LEDS FLASHING.  For voltage detection see Grace Engineered Products R-3W.
R-3FS-Series
3 Phase Fuse Status Indicator
Troubleshooting Guide
A. Normal, fuse good, electrical contact across fuse.
A. Unconnected or blown fuse.

B. Bad connection load side (white stripe wire).

C. Both of the above
A. Phase voltage loss with no motor regeneration.

B. The above accompanied with an unconnected or blown fuse.
A. Bad connection line side (solid color wire).

B. The above accompanied with an unconnected or blown fuse

C. Phase voltage loss with motor regeneration accompanied with an unconnected
A. (2) Unconnected or blown fuses.

B. Corresponding wires interchanged between solid colors or white stripe colors.

C. 1 or 2 unconnected or blown fuses and B.
A.(3) Unconnected or blown fuses.

B. Line side connections do not correspond to Load Side connections.

C.1 or more unconnected or blown fuses and B
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