Sinetamer RM-ST40 Parallel 380V – 480V Transient Voltage Surge Supressor

The SineTamer RM series of units blends outstanding high-energy “impulse” suppression with excellent “ring-wave” transient protection. This durable device is intended for general purpose and sensitive/critical load applications. The RM-ST40 is typically installed at small service entrances up to 400 amps, distribution and subdistribution panels. Compact size and non-metallic enclosure design also allow it to be installed directly inside electrical panels and individual equipment disconnects. The internal installation provides the absolute shortest possible lead length and optimum performance. The RM-ST40 is extremely effective in limiting internally generated transients and is an absolute must on panels feeding office locations and/or microprocessor based equipment. This economical device has features that are not available in devices costing many times its price. Its compact size makes installation a breeze. Maintenance Free operation and 15 Year Unlimited Free Replacement Warranty provides peace of mind.


  • Product Application

    Product Application

    For protecting Three Phase Changeover Panels, ATS Panels, distribution boards and electronics in homes. For protecting Distribution Panels feeding critical and sensitive equipment in commercial or industrial facilities e.g. ATS panels, UPS, server rooms, manufacturing machines, MCC panels, chillers, compressors

Technical Specification

Designed for use at ANSI/IEEE Categories C, B and A with susceptibility up to medium exposure levels. Designed to protect sensitive/critical loads fed from distribution panels, branch panels and/or individual equipment panels.
ABS Plastic, UL94-0
3/4” conduit fitting (internally threaded) and external mounting feet.
#10 stranded wire.
Circuit Design
Parallel connected, internally fused, hybrid design incorporating all mode protection, and utilizing our encapsulated design to provide improved durability.
Protection Modes
L-N, L-L (Normal Mode), and L-G, N-G (Common Mode). (Seven discrete modes)
Input Power Frequency
50-60Hz constant
EMI/RFI Noise Attenuation
30dB Max. from 1kHz to 10MHz
Up to 3.5 uF Max
Circuit Diagnostics
Super Bright LED, 1 per phase, normally on.
Circuit Interrupt
External and internal (see installation instructions for details).
Component Level Thermal Fusing/Phase Level Current Fusing