Sub-Cycle Disconnect Switches

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Ultra-fast sub-cycle disconnect switch for medium-voltage distribution

The Innova SDS (Sub-cycle Disconnect Switch) is an advanced medium-voltage switching solution designed to enhance power system protection by isolating faults or shedding nonessential loads in ½ cycle (≈8 ms) — significantly faster than traditional switching technologies.

Optimized for medium voltage distribution applications, the Innova SDS improves system reliability, safety, and performance. It features programmable logic, self-monitoring capability, and ultra-fast response, enabling utilities and industrial operators to manage disturbances proactively and maintain overall network stability.

Key Benefits:

Sub-cycle (½ cycle) operation for ultra-fast disconnection or load shedding
Maximize network resilience with versatile fault detection (three-phase and single-phase)
No mechanical contactors — reduces wear and maintenance
Air-cooled, no liquid cooling — simplifies maintenance and lowers operating costs
Digital intelligence for real-time monitoring and control
Transformerless design — compact and environmentally friendly
Long operational life and low total cost of ownership
Backed by Southern States' 24/7 after-sales support and long-life engineering

Product Family

Innova SDS

Medium-voltage sub-cycle disconnect switch
Factory-assembled and tested for fast deployment
Detects sags, swells, and voltage interruptions in real time
Automatically sheds loads or disconnects faults within ½ cycle
Designed to isolate nonessential loads and enhance network protection
Self-monitoring controller with programmable logic and digital interface
Air-cooled and transformerless, efficient, compact, and clean
Minimal maintenance required; no heat exchangers or cooling fluids

Voltage Class	Basic Insulation Level (BIL)	Continuous Current	Fault Current Ride Through (X/R = 15)
Voltage Class	Basic Insulation Level (BIL)	(A)	Symmetrical (kA)	Asymmetrical (kA)
5 kV	60 kV	600	9, 18	23, 45
5 kV	60 kV	1,400	18	45
15 kV	95 kV	600	9, 18	23, 45
15 kV	95 kV	1,200	18	45
27 kV	125 or 150 kV	400	6, 9, 12, 18	15, 23, 30, 45
		600	6, 9, 12, 18	15, 23, 30, 45
		1,200	18	45
38 kV	150 or 200 kV	400	6, 12	15, 30
38 kV	150 or 200 kV	600	12	30

Product Bulletins

Innova SDS Product Bulletin

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Data Sheets

Innova SDS Data Sheet

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Applications and Industries

The Innova SDS is ideal for power distribution systems where speed, reliability, and automated protection are essential. It’s designed for operators who need to quickly isolate problems and maintain stability across interconnected loads.