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Source Transfer Switches

Source Transfer Switches (STS) or Static Transfer Switches is another name they have been called, are used to increase the resilience of power continuity plans by introducing a dual-input source of primary AC power. An STS device will automatically connect its output to one of two AC power sources known as primary and secondary supplies should the the preferred source go out of tolerance. These can include: two uninterruptible power supplies, or two mains power supplies, or a combination of the two. STS devices can also be ‘switched’ manually and remotely. Small STS systems generaly rated at 16Amp tend to be relay-based with fast switching characteristics and are relatively cheaper then synchronous STS designs. However, Synchronous STS design offer additional security when protecting loads of 32amps or more. STS solutions generally incorporate Power Distribution Units (PDUs) with up to ten output IEC 320 type sockets, with intelligent monitoring including voltage and load percentages. Larger STS systems tends to be hardwired and used within more complex switching arrangements of a power continuity plan.

Most static or source transfer switches whether single or three phase can be used as generic devices within a UPS installation. Manufacturer specific static or source transfer switches may be preferred for site-wide monitoring and control using manufacturer specific remote monitoring software packages.

For advice on STS solutions, a site survey or quotation – complete our Enquiry Form, call 0800 978 8988 or send us an email. If you cannot find the brand, size or product you are looking for on our website, please let us know.

Critical Power Supplies - AP7723 Front from Critical Power Supplie
APC rack ats 16a/230v, c20 in, (8) c13 (1) c19
£570.77 £570.77
eta: 2-5 days
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Critical Power Supplies - APC AP7721 front from Critical Power Sup
APC rack ats, 10a/230v, c14 in, 12xc13 out
£501.13 £501.13
eta: 2-5 days
details >
Critical Power Supplies - Cross Rack 16-64A STS from Critical Powe
Chloride cross rack 16amp sts
£2,665.00 £2,665.00
eta: 2-5 days
details >
Critical Power Supplies - EATS16 Source Transfer Switch
Eaton eats16 power source transfer switch
£451.46 £451.46
eta: 2-5 days
details >
Critical Power Supplies - EATS16 Source Transfer Switch
Eaton eats16n power source transfer switch
£516.04 £516.04
in stock
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Critical Power Supplies - Eaton ats 30a netpack
Eaton eats30n UPS network management card
£643.01 £643.01
eta: 2-5 days
details >
Critical Power Supplies - Riello Multiswitch STS 2011 from Critica
Master switch - sts - mts 100amp-4 pole
Price on Application POA
poa
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Critical Power Supplies - Riello Multiswitch STS 2011 from Critica
Master switch - sts - mts 150amp -4 pole
Price on Application POA
poa
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Critical Power Supplies - Riello Multiswitch STS 2011 from Critica
Master switch - sts - mts 200amp-4 pole
Price on Application POA
poa
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Critical Power Supplies - Riello Multiswitch STS 2011 from Critica
Master switch - sts - mts 250amp-4 pole
Price on Application POA
poa
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Critical Power Supplies - Riello Multiswitch STS 2011 from Critica
Master switch - sts - mts 300amp-4 pole
Price on Application POA
poa
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Critical Power Supplies - Riello Multiswitch STS 2011 from Critica
Master switch - sts - mts 400amp-4 pole
Price on Application POA
poa
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Critical Power Supplies - MMS-front Riello STS
Master switch 120a single phase static transfer switch
£2,317.22 £2,317.22
in stock
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Critical Power Supplies - MMS-front Riello STS
Master switch 32a single phase static transfer switch
£1,543.16 £1,543.16
in stock
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Critical Power Supplies - MMS-front Riello STS
Master switch 63a single phase static transfer switch
£1,852.99 £1,852.99
in stock
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AP7724 STS from Critical Power Supplies
Rack-mount transfer switches rack ats, 2u 230v, 32a
£690.99 £690.99
eta: 2-5 days
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Critical Power Supplies - Riello Multiswitch ATS from Critical Pow
Riello multiswitch ats
£312.98 £312.98
in stock
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Critical Power Supplies - MULTISWITCH-N-PLUS upto 16amp single pha
Riello sts multiswitch n plus
£434.98 £434.98
in stock
details >