Sinetamer LA-ST120 Parallel 220V/480V Transient Voltage Surge Supressor

The SineTamer© LA series of units blends outstanding high-energy “impulse” suppression with unsurpassed “ringwave” transient protection Frequency Attenuation Network®. This durable device is intended for general purpose and sensitive/critical load applications. 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 LA-ST120 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 20 Year Unlimited Free Replacement Warranty provide peace of mind. Standard unit is Type 2 10kA UL Nominal Discharge Current; Optional Type 2 20kA IN is available.


  • Application


    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.

Technical Specification

Parallel connected, transient voltage surge suppressor device utilizing both high-energy handling and Frequency Attenuation Network® circuitry for virtual elimination of ring wave type transients
High strength ABS Plastic, NEMA 4 rated enclosure
1” conduit fitting (internally threaded) and external mounting feet.
Connection Method
#10 stranded wire.
Circuit Design...
Parallel connected, internally fused, hybrid design incorporating discrete all mode protection
(10 modes for 3 phase wye units*) and utilizing our encapsulated design to provide
improved durability.
...Circuit Design
All suppression circuits are encapsulated in our exclusive compound to assure long component life and complete protection from the environment and/or vibration.
Protection Modes
Dedicated protection components and circuitry for each mode. Discrete L-N, L-L (Normal
Mode), and Discrete L-G, N-G (Common Mode). 10 modes / 3 phase wye system.
Input Power Frequency
50-420Hz constant (60Hz typical)
EMI/RFI Noise Attenuation
30dB Max. from 1kHz to 10MHz
Circuit Diagnostics
Super Bright LED, 1 per phase, normally on. Dry relay contacts for remote monitoring.
Circuit Interrupt
External and internal (see installation instructions for details).
Component Level Thermal and Board Level Current Fusing
kAIC Rating
200 kAIC when installed according to installation instructions
LA-STB = Type 2 20kA IN Type 1 available – contact factory for proper model number.