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Mersen FSSC Series Non-Fused Disconnect Switch, 600V UL 98 Rated
The Mersen FSSC/FS Series (Front or Side Operated) is a family of extremely durable, manually operated, non-fused disconnect switches built to the UL 98 standard for "make and break" power circuit switching on load. This family is available across the FS150 and FS200 platform, rated 600 VAC / 600 VDC with an ampere range of 30-100 A on this listing (the broader FSSC/FS platform is UL- and CSA-listed from 30 A to 1200 A), and offered in 2, 3, or 4 pole configurations. Tested and approved for demanding service entrance applications, these switches combine loadbreak switchability, DIN-rail or panel mounting, and front- or side-operated handle designs for service entrance, main panel, and industrial disconnect duty.
Key Features
- Ampere Range: 30-100 A on this listing, with the FSSC/FS platform (including FS150 and FS200 models) rated from 30 A to 1200 A for a broad range of load-break applications.
- Pole Configurations: Available in 2, 3, or 4 pole versions to match circuit requirements.
- Voltage Rating: 600 VAC and 600 VDC for use in demanding power distribution circuits.
- Switchability: Loadbreak design lets the switch make and break power circuits on load, including service entrance duty.
- Front or Side Operated: Lockable, defeatable, and padlockable external handles for safe, controlled operation and lockout/tagout.
- Mounting: Screw/nut, screw, DIN-rail/screw, or snap-in mounting options for flexible installation.
- Side-Mounted Auxiliary Contacts: Built-in auxiliary contacts support supplemental circuit monitoring and control.
- Compact, Robust Design: Heavy-duty construction using up-to-date disconnect switch technology for long service life.
Certifications & Compliance
- UL 98 Service Entrance Rated, UL Listed under WHTY File E191605 (NLRV File E196672)
- CSA Certified, Class 4652-04, File 703166 (CSA 22.2 #4)
- Meets IEC 947-3 requirements and carries the CE mark
- SCCR rated 100kA with Class J fuses at 30A
Technical Specifications
- Mounting Method: Screw/Nut Screw Din-rail/Screw Snap-in
- UL Certification: E191605 WHTY.E191605E1996672 NLRV.E196672
- CSA Certification: 4652-04 703166
- Number of Poles: 2, 3, 4
- SCCR: 100kA with Class J 30A kA
Typical Applications
- Service Entrance and Main Panel Disconnects up to 600 VAC, 1200 A
- "Make and Break" Power Circuit Applications on Load
- NFPA 79 Industrial Machinery Solutions
- Photovoltaic (Solar) Disconnect Applications
- Commercial and Industrial Power Distribution
Why Mersen?
Mersen's FSSC/FS Series disconnect switches, including the FS150 and FS200 models, combine UL 98 service entrance ratings, CSA certification, and a 100kA SCCR rating with Class J fuses to deliver code-compliant, reliable performance for professional electrical work. With loadbreak switchability, lockable front- or side-operated handles, and flexible DIN-rail or panel mounting, these switches are engineered for the demanding, make-and-break duty required in service entrance and industrial disconnect applications.
Manufacturer Resources
Mersen Product Catalog
Product Specs
- Mounting Method:
- Screw/Nut Screw Din-rail/Screw Snap-in
- AC Voltage:
- 600 VAC
- UL Certification:
- E191605 WHTY.E191605E1996672 NLRV.E196672
- DC Voltage:
- 600 VDC
- Lead Free:
- Consult Technical Services
- ROHS Compliant:
- Consult Technical Services
- CSA Certification:
- 4652-04 703166
- Number of Poles:
- 2, 3, 4
- Ampere Range:
- 30-100 A
- CE conformity:
- Consult Technical Services
- Switchability:
- Loadbreak
- SCCR:
- 100kA with Class J 30A kA
- list_batch:
- MERSEN-20260825
- Product Type:
- Disconnect Switch
- Department:
- Electrical
- Product Group:
- Power Distribution
- Product Subgroup:
- Safety Switches & Disconnects
Mersen FS150 – Frequently Asked Questions
1) Can the Mersen FSSC disconnect switch be used as a service entrance disconnect?
Yes. The Mersen FSSC/FS Series is UL 98 rated and listed under guide WHTY, File E191605, which covers service entrance duty, and the switch is a loadbreak design so it can make and break the circuit on load. Typical use is service entrance or main panel disconnects up to 600 VAC. It is also CSA certified to CSA 22.2 #4, class 4652-04, File 703166.
2) Is this Mersen disconnect switch rated for DC, for example a solar PV array?
It carries both a 600 VAC and a 600 VDC rating, and photovoltaic disconnect duty is one of the listed applications. That DC rating is the point to check against your array's maximum system voltage before you commit.
3) What amperage and pole counts does the Mersen FSSC non-fused disconnect cover?
30 to 100 A, in 2, 3, or 4 pole versions. The wider FSSC/FS platform is UL and CSA listed from 30 A through 1200 A, so if you need more than 100 A you are looking at a larger frame in the same family rather than a different product line.
4) What wire sizes will the lugs on this Mersen disconnect accept?
Terminal ranges across the FSSC/FS switches run #10 to #14, #6 to #10, #1 to #12, 300 MCM to #6, 600 MCM to #2, and 2 x 600 MCM to #2. The range you get tracks the frame size, so match the conductor you are landing, including any parallel 600 MCM runs, to the frame before ordering.
5) What short circuit current rating does the Mersen FSSC switch have?
100 kA SCCR when protected by Class J fuses at 30 A. Since the switch itself is non-fused, that rating depends on the upstream Class J protection being in place, which matters if you are building to an NFPA 79 industrial machinery panel and have to post an SCCR on the nameplate.
6) I need a disconnect that also holds fuses instead of a non-fused switch - what should I order?
The Mersen FSSC/FS is a non-fused disconnect switch, so overcurrent protection has to come from somewhere else in the circuit. For a switch with the fuse carrier built in, the Square D TeSys GS1DU3 is a fuse disconnect switch rated 3-pole, 30A, 600V. Note that the Mersen's 100kA SCCR is stated with Class J fuses at 30A, so the fuse class you use matters to the short circuit rating either way.
7) The disconnect is going outside on a washdown wall - is the Mersen FSSC the right choice or do I need something else?
The Mersen FSSC/FS is supplied as a switch mechanism with screw/nut, screw, DIN-rail/screw, or snap-in mounting and a lockable front- or side-operated handle, which suits mounting inside a panel or enclosure you provide. For a wet or washdown location where you want the switch to arrive already enclosed, the Square D MD is a 3-pole motor disconnect switch supplied in a NEMA 4X enclosure.
8) For a photovoltaic DC disconnect, which of these switches should I be looking at?
The Mersen FSSC/FS is rated 600 VDC as well as 600 VAC and lists photovoltaic among its applications, which is the reason to specify it on a solar array. The comparable Square D TeSys GS1DU3 is described at 600V as a fuse disconnect switch and the Square D MD as a motor disconnect, so for a DC PV circuit confirm the DC rating with those before substituting.
9) Does this switch mount on DIN rail or does it need a panel plate?
Either works. Mounting options on the FSSC/FS Series are screw/nut, screw, DIN-rail/screw, and snap-in, so it drops into a DIN-rail industrial control panel or bolts directly to a back plate.
10) Can the handle be padlocked for lockout/tagout?
Yes. The FSSC/FS switches use lockable, defeatable, padlockable external handles, available front- or side-operated, so the switch can be locked in the off position for LOTO. Side-mounted auxiliary contacts are built in if you also need a status signal back to a controller.
11) What are the alternatives if I just need a plain 3-pole 600V manual disconnect?
Two we carry alongside the Mersen FSSC/FS: the Bryant 30103D from the 103D Series, a 600 V 3-pole manual disconnect, and the Square D TeSys VLS with a protruding rotary handle sized for a 65 x 65 mm cutout if door-mounted rotary operation suits the enclosure better than the Mersen front- or side-operated handle.
12) Is the Square D TeSys VLS rotary handle disconnect a substitute for the Mersen FSSC switch?
They are not the same kind of item. The TeSys VLSH2S5B is a protruding rotary handle disconnect switch with a 65x65 mm handle, so the handle style and cutout are what define it. The Mersen FSSC/FS is offered in front- or side-operated versions with lockable, defeatable, padlockable external handles and carries UL 98 service entrance approval under File E191605. If the panel door is already cut for the 65x65 mm rotary handle, the Mersen handle arrangement will not drop into that opening.
13) My feeder lands 300 MCM conductors - will a 30A rated disconnect like the TeSys GS work?
No. The Square D TeSys GS1DU3 is rated 3-pole, 30A, 600V, which is a branch-level device. The Mersen FSSC/FS covers a 30-100 A ampere range with wiring ranges including 300MCM to #6, 600MCM to #2, and 2 x 600MCM to #2, so it is the one to size for large feeder conductors.
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Does the Mersen FS150 come with a warranty?
Absolutely. The Mersen FS150 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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