Use interchangeably with isolation switches from major manufacturers:
Isolating switches designed for Ex zones: 1, 2, 21, 22
One device – many functions (operation also as a main or safety switch: category AC-3 and AC-23). This increases functionality while saving space and simplifying installation.
LOTO locking option (three padlocks)
Durability with frequent cycling
Reduction of service costs
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Insight into electrical diagrams from the data sheet
Technical data:
Certifications: ATEX, IECEx
ATEX designation:
II 2 G Ex db eb IIC T5/T6 Gb
II 2 D Ex tb IIIC T85oC Db
IECEx designation:
Housing material: SMC (GRP)
Knob size:
diameter: 105mm
overall width with handle: 120mm
Permissible ambient temperature: -40°C to +55°C
Degree of protection: IP66
Rated voltage: 230V – 690V
Rated current: 20A – 80A
In stainless steel housing: 20A-180A
Short-circuit protection
(fuse ratings):
20A/25A: 20kA, 500V/35A
30A/40A: 20kA, 500V/63A
63A/75A/80A: 50kA, 500V/160A
Fuse type: gG (IEC/EN 60269-1)
Rated insulation voltage (Ui): 800V
Rated surge voltage (Uimp): 6kV
Rated short-lasting residual current (Icw):
3kA for 20A, 25A, 35A, 40A
10kA for 63A, 75A, 80A
Rated short-circuit breaking capacity (Icm):
4kA for 20A, 25A, 35A, 40A
17kA for 63A, 75A, 80A
Conductor cross-sections:
20A/25A: 2×1.5 to 4mm²
35A/40A: 2×10mm²
63A/75A/80A: 2×16 to 25mm²
Price:
Service safety – the LOTO system
Ex HARDO isolation switches allow the knob to be locked in the “OFF” position with three padlocks – LOTO (Lockout/Tagout) compliant.
Prevent accidental switching on
Possibility of simultaneous locking by several persons
OSHA compliant, EN 1037
Simple and integrated operation
Category of use: AC-3 / AC-23
HARDO’s ATEX isolating switches have an AC-3 and AC-23 use category according to IEC 60947-3, which means that they can also be used as operating switches (load disconnectors and switches operating under load) as well as safety switches.
Characteristics:
AC-3: control of squirrel-cage motors – starting and stopping during operation
AC-23: inductive loads (motors, transformers) – frequent disconnection under load
Using an isolating switch that meets these requirements eliminates the need for additional operating disconnectors or switches. In this way, the HARDO isolation switch functions simultaneously as a main power disconnector, operating switch and safety element, resulting in simplified installation and increased system reliability.
Construction and durability of SMC composite housing
The housing of the Ex HARDO isolation switches is made of a high-performance glass fibre-reinforced SMC (Sheet Moulding Compound). This material offers exceptional durability and resistance to environmental influences.
SMC material properties:
mechanical resistance: up to 90% of original strength after 20 years
Compliant with ISO 4892 (UV, temperature, humidity)
UL 746C certification
Thermal and electrical insulation
Chemical and fire resistance
No corrosion, no maintenance
Low weight – easy installation
High surface durability
ATEX HARDO isolation switch – reliable safety in Ex zones
HARDO’s Ex ATEX isolation switches are advanced devices that can also act as a main and safety switch (they are disconnectors and switches in the AC-23 and AC-3 use category).
Ex isolation switches have been designed for the safe and permanent disconnection of electrical circuits in gas and dust hazardous areas. Thanks to the use of high-quality components, robust modular construction and compliance with the requirements of the ATEX and IECEx directives, these circuit breakers are the ideal solution for industrial plant designers, machine manufacturers and end users for whom safety and reliability are a priority.
Application
Disconnectors for motors, pumps, fans, dust collectors
Working in applications with high inertia
Service protection for maintenance work (LOTO compliance)
Disconnection of motors, transformers, heaters and inductive equipment
In combination with automation systems it can act as a power status indicator
Electrical contacts
Main contacts: 3, 4, 5 or 6
Auxiliary contacts:
NO / NO + NC / 2NO
PE / PE + N / PE + N disconnected
Material: silver alloy
Individual configuration of an Ex isolation switch
Thanks to its modular design, you can configure the switch to suit your needs.
Cable glands
polyamide (M16-M63; up to 16 pieces)
metal: brass / nickel-plated brass / stainless steel (M16-M63; up to 12 pieces)
for unreinforced / reinforced / shielded cables
earthing through the brass plate to the outside of the switch via the earthing screw
Operating instructions
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