Key Players
Competitive Landscape
Key Players
ABB, Schweitzer Engineering Laboratories, GE Vernova, Hitachi Energy, S&C Electric Company, Siemens, Beckwith Electric (Hubbell).
Table 6: Company Developments and Commercial Implications
| Evidence | Commercial effect | Buyer action |
|---|---|---|
| On 5 March 2026, SEL and Puget Sound Energy reported the Samish Island microgrid. It recorded five islanding events in its first storm season [7]. | Shows a recloser control and a controller working together to island a group of customers. | Ask suppliers for tested recloser-plus-controller packages, not separate parts. |
| Australia's AS/NZS 4777.2:2020 Amd 2:2024 came into effect on 23 August 2025. Non-complying inverters were removed from the approved list [19]. | Products that miss the amendment lose listing and certificate eligibility. | Confirm that each model is still on the approved list before specifying it. |
| The UK Department for Energy Security and Net Zero reported provisional solar capacity of 23.4 GW on 29 October 2026 [17]. It also reported a record 296,000 installations in 12 months [17]. | More generators join distribution feeders each year. | Plan protection settings reviews for feeders with the fastest installation growth. |
| In a letter of 1 May 2018, UK Power Networks offered GBP 4,000 plus VAT for a relay change [16]. It offered GBP 2,500 plus VAT for a settings change [16]. | Operators priced the switch from vector shift to rate of change of frequency. | Check whether older sites still run vector shift settings before an audit. |
Source: Future Market Insights analysis of the islanding protection market, 2026.
How are the companies positioned?
The main difference is where the islanding function sits. SEL, ABB, GE Vernova and Hitachi Energy list relays with detection or interconnection functions [4][5][8][10]. Siemens and Beckwith Electric sell protection relays for the same networks [13][14]. SEL and S&C also sell recloser controls and reclosers for the feeder [6][11][12].
What matters when a buyer qualifies an islanding protection supplier?
Support for the local interconnection rule comes first. SEL says the SEL-651R supports IEEE 1547-2018 and fast islanding detection [6]. British and Australian buyers must meet G59 Issue 3 Amendment 3 settings and AS/NZS 4777.2:2020 Amd 2:2024 [16][19]. Test evidence for the inverter matters too. IEC 62116 provides the islanding prevention test for PV inverters [2].
Which capabilities distinguish the product offers?
The detection method and the way methods are combined differ by product. SEL offers optional vector shift on the SEL-751 [5]. ABB builds voltage vector shift into the REG615 with a typical operate time of 53 ms at 50 Hz [4]. GE Vernova lists frequency rate of change in the Multilin 850 and P40 Agile ranges [8][9]. S&C's TripSaver II is a single-phase recloser for lateral lines [12]. The IntelliRupter is a feeder interrupter with ratings up to 16,000 A symmetrical at 15.5 kV [11].
How does geographic reach affect competition?
Rules differ by country, so each supplier has to carry local approvals. For generators installed before 27 April 2019, the United Kingdom applies G59 Issue 3 Amendment 3 [16]. Newer connections use G98 or G99 [28]. Australia applies AS/NZS 4777.2:2020 Amd 2:2024 [19]. The United States applies IEEE 1547-2018 [1], and Germany applies VDE-AR-N 4105 [3]. ABB lists a generator and interconnection protection relay [4], and Hitachi Energy lists interconnection protection for networks with many distributed energy resources [10].
Representative Company Overview
Table 7: Islanding Protection Market Representative Company Overview
| Company | Positioning | Verified activity |
|---|---|---|
| ABB | Interconnection relay maker with vector shift islanding detection. | Product guide for the REG615 lists voltage vector shift protection that detects islanding, with a typical operate time of 53 ms at 50 Hz [4]. |
| Schweitzer Engineering Laboratories | Feeder relays and recloser controls with islanding detection. | Completed the Samish Island microgrid with Puget Sound Energy, reported on 5 March 2026 [7]. |
| GE Vernova | Feeder protection relays with frequency rate of change elements. | Lists 81R in the Multilin 850 and 81df/dt in the P40 Agile range [8][9]. |
| Hitachi Energy | Relion relay range for distribution networks. | Lists interconnection protection among typical applications of the REF650 [10]. |
| S&C Electric Company | Reclosers and fault interrupters for distribution feeders. | Rates the IntelliRupter PulseCloser up to 16,000 A symmetrical at 15.5 kV [11]. |
| Siemens | SIPROTEC multifunctional protection relays. | Positions SIPROTEC with universal protection for feeders, lines and motors in medium-voltage grids [13]. |
| Beckwith Electric (Hubbell) | Distribution protection and control relays. | Describes the M-7651A as built for feeder protection, bay control and DG interconnection protection [14]. |
Source: Future Market Insights analysis of the islanding protection market, 2026.
Research Methodology
The islanding protection market assessment was conducted using primary interviews and secondary literature analysis combined with top-down data triangulation to validate market size, segment shares, and competitive positioning.
