Interchangeable with switches from leading manufacturers:
Designed for Ex zones: 1, 2, 21, 22
Five protections (overload, short-circuit, thermal, phase loss, undervoltage – optional)
The overload protection follows tripping characteristics comparable to those used by leading manufacturers.
Large dial ⌀ 97 mm, for easy operation with gloves
Possibility of locking in OFF position (one padlock)
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Technical data:
Dimensions: please see details below
Certifications: ATEX, IECEx
ATEX designation:
II 2 G Ex db eb IIC T4/T5/T6 Gb
II 2 G Ex db eb IIC T4/T5/T6 Gb
II 2 D Ex tb IIIC T85oCDb
IECEx designation:
Housing material: GRP
Knob size: Ø 97 mm
Permissible ambient temperature: -40°C to +55°C
Degree of protection: IP66
Rated voltage: 440 V
Protections applied: overload; phase loss; short circuit; thermal; undervoltage (optional);
Overload trip setting range: 0.1 to 25 A
Switching capacity of motor in AC3 category: up to 440 V / 25 A
Main contacts: 1 – 10 mm² (6 – 10 mm² using collets)
Auxiliary contacts: 1 – 2.5 mm²
Auxiliary contact capacity: AC15 1 A / 230 V
Rated switching capacity: high (up to 65 kA)
Price:
5 types of security – 100% as offered by major market players
01/ OVERLOAD
02/ SHORT-CIRCUIT PROTECTION
03/ THERMAL
04/ PHASE LOSS
05/ UNDERVOLTAGE (optional)
Overload protection
The motor circuit breakers for hazardous areas have built-in overload protection, which protects the motor not only against long-term overload, but also against frequent restarts or brief overloads that can lead to overheating of the windings. The motor circuit breakers are available with adjustable overload protection in the 0.1–25 A range. The unit is rated for 440 V operation.
Practical aspect:
Protects the motor from prolonged loads exceeding its rated power, which could cause winding overheating, insulation damage, and reduced equipment lifespan.
Technical principle:
Usually implemented using a bimetal element or thermal sensors placed in the windings. The current increase heats the sensing element, and when the set temperature is reached, the circuit is mechanically disconnected.
Practical example:
In a conveyor belt, the overload protection will switch off the motor if the belt is blocked by an obstacle, preventing winding burnout.
Setting ranges (0.1 – 25 A)
The pre-setting of the appropriate trip current value takes place at the production stage, according to the customer’s requirements and the application of the circuit breaker in question. It is also possible to adjust the range directly on site.
For values of the overload ranges, see table of configurations below.
Phase Failure Protection
Practical aspect:
Prevents a three-phase motor from operating when one of the phases is missing, which would cause uneven load on the windings, increased current draw in the remaining phases, and risk of damage.
Technical principle:
The control system monitors the presence of all three phases. The absence of a signal from one phase immediately disconnects the motor power supply.
Practical example:
In an industrial pumping station, phase failure protection will shut down the pump if one phase fails, preventing overheating and breakdown.
Short Circuit Protection
Practical aspect:
Protects the motor, cables, and control equipment from the effects of short circuits, which can damage the installation or cause fire.
Technical principle:
Uses an electromagnetic trip that reacts to a sudden, very high current increase. The strong magnetic field pulls the mechanism core, instantly disconnecting the contacts.
Practical example:
In a compressor motor, after winding insulation failure, short circuit protection disconnects power within a fraction of a second, preventing arc damage.
Thermal Protection
Practical aspect:
Protects the motor from overheating regardless of the cause — overload, poor ventilation, high ambient temperature, or mechanical issues.
Technical principle:
Temperature sensors (e.g., PTC thermistors or thermal switches) are built into the motor windings. When the limit temperature is reached, the sensor signal triggers motor shutdown or a motor protection switch.
Practical example:
In a fan operating in a high-temperature zone, the thermal sensor will shut down the drive when winding temperature exceeds the safe value.
Undervoltage trip (U)
As an option, motor circuit breakers intended for use in hazardous areas can be fitted with an undervoltage trip, the purpose of which is to automatically switch off the device if the supply voltage falls below a safe level. This protects both the motor itself and other plant components from the effects of unstable power supply conditions. Importantly, the switch prevents the motor from restarting automatically when the voltage returns, which is important for safety in Ex zones.
Practical aspect:
Prevents the motor from running at voltage lower than permissible, which could cause increased current, reduced torque, and winding overheating.
Technical principle:
The measuring circuit constantly monitors the voltage value. If it drops below the set threshold, the mechanism disconnects the circuit and prevents restart until proper voltage is restored.
Practical example:
In a packaging line, undervoltage protection will shut off the feeder motor when voltage drops so low that it might stop mid-cycle and get damaged.
Trip characteristics for overloads
The graph shows the dependence of the tripping time on the current value (expressed as a multiple of the rated current In) at an ambient temperature of 30°C. This characteristic provides an effective response for both light and heavy overloads:
for high overloads (e.g. 8-10 ×In) – in milliseconds,
for low overloads (1.2-2 ×In), the response occurs after a few minutes or so.
Motor circuit breakers for explosive atmospheres
HARDO motor circuit breakers of the HCS1P series are designed for operation in potentially explosive atmospheres, in zones 1, 2, 21 and 22. Their primary type of protection in the context of explosion safety is Ex e protection (i.e. reinforced construction). In addition, Ex HARDO motor circuit breakers have overload protection and can be equipped with undercurrent protection and auxiliary contacts (1NO + 1NC)
The Ex HCS1P motor circuit breakers are characterised by their high rated switching and breaking capacity – up to 65 kA, which ensures effective operation even in installations with high short-circuit energy. For motor control in category AC3, the device can handle loads up to 440 V / 25 A.
Operating principle based on the wiring diagram
The diagram shows the basic connections of the main circuits (L1, L2, L3 – T1, T2, T3), the undervoltage trip control circuit and the auxiliary contacts (13-14 and 21-22). When voltage is applied and the circuit is activated, the motor is switched on. In the event of an overload or voltage drop, the trip mechanism disconnects the power supply. The operating contact category is AC-3
The main terminals are suitable for conductors with a cross-section of 1 to 10 mm² (or 6-10 mm² when using collets), allowing flexible adaptation to different installations.
Auxiliary contacts 1NO + 1NC
Ex motor circuit breakers may include auxiliary contacts (one NO and one NC) which are independent of the main tracks and can be used for:
transmission of the circuit-breaker operating status signal to a higher-level system (e.g. PLC),
activation of optical or audible signalling,
blocking the start-up of other devices in the system.
The category of auxiliary contacts is AC15 (1 A/230 V). The terminals for the auxiliary contacts allow the connection of wires with a cross-section of 1 to 2.5 mm².
Switch housing: robustness and safety
The motor circuit breaker housing for hazardous areas is made of unsaturated polyester resin. Reinforced with glass fibre and mineral fillers, the housing does not melt, drip, or emit excessive smoke in the event of a fire. The product does not contain halogens, heavy metals or any substances listed on the REACH SVHC list.
The housing provides high mechanical and chemical resistance.
The outer casing material has additives to reduce electrification, which negates the risk of ignition of explosive atmospheres due to electrostatic discharge.
Configurations
|
GLANDS
|
OVERLOAD PROTECTIONS
|
PHASE LOSS PROTECTION
|
SHORT CIRCUIT PROTECTION
|
THERMAL PROTECTION |
UNDERVOLTAGE PROTECTION |
AUXILIARY CONTACTS NO + NC |
ORDER NUMBER |
|---|---|---|---|---|---|---|---|
|
2 x M25 |
YES (0,1 – 0,16 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01211 |
|
2 x M25 |
YES (0,16 – 0,25 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01221 |
|
2 x M25 |
YES (0,25 – 0,4 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01231 |
|
2 x M25 |
YES (0,4 – 0,63 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01241 |
|
2 x M25 |
YES (0,63 – 1,0 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01251 |
|
2 x M25 |
YES (1,0 – 1,6 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01261 |
|
2 x M25 |
YES (1,6 – 2,5 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01271 |
|
2 x M25 |
YES (2,5 – 4,0 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01281 |
|
2 x M25 |
YES (4,0 – 6,3 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01291 |
|
2 x M25 |
YES (6,3 – 10,0 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01301 |
|
2 x M25 |
YES (10,0 – 16,0 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01311 |
|
2 x M25 |
YES (16,0 – 20,0 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01321 |
|
2 x M25 |
YES (20,0 – 25,0 A) |
YES |
YES |
YES |
NO |
NO |
HCS1P 252616 S01331 |
|
GLANDS
|
OVERLOAD PROTECTIONS
|
PHASE LOSS PROTECTION
|
SHORT CIRCUIT PROTECTION
|
THERMAL PROTECTION |
UNDERVOLTAGE PROTECTION |
AUXILIARY CONTACTS NO + NC |
ORDER NUMBER |
|---|---|---|---|---|---|---|---|
|
3 x M25 |
YES (0,1 – 0,16 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01212 |
|
3 x M25 |
YES (0,16 – 0,25 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01222 |
|
3 x M25 |
YES (0,25 – 0,4 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01232 |
|
3 x M25 |
YES (0,4 – 0,63 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01242 |
|
3 x M25 |
YES (0,63 – 1,0 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01252 |
|
3 x M25 |
YES (1,0 – 1,6 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01262 |
|
3 x M25 |
YES (1,6 – 2,5 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01272 |
|
3 x M25 |
YES (2,5 – 4,0 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01282 |
|
3 x M25 |
YES (4,0 – 6,3 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01292 |
|
3 x M25 |
YES (6,3 – 10,0 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01302 |
|
3 x M25 |
YES (10,0 – 16,0 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01312 |
|
2 x M32 + 1 x M25 |
YES (16,0 – 20,0 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01322 |
|
2 x M32 + 1 x M25 |
YES (20,0 – 25,0 A) |
YES |
YES |
YES |
YES |
NO |
HCS1P 252616 S01332 |
|
GLANDS
|
OVERLOAD PROTECTIONS
|
PHASE LOSS PROTECTION
|
SHORT CIRCUIT PROTECTION
|
THERMAL PROTECTION |
UNDERVOLTAGE PROTECTION |
AUXILIARY CONTACTS NO + NC |
ORDER NUMBER |
|---|---|---|---|---|---|---|---|
|
3 x M25 |
YES (0,1 – 0,16 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01213 |
|
3 x M25 |
YES (0,16 – 0,25 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01223 |
|
3 x M25 |
YES (0,25 – 0,4 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01233 |
|
3 x M25 |
YES (0,4 – 0,63 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01243 |
|
3 x M25 |
YES (0,63 – 1,0 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01253 |
|
3 x M25 |
YES (1,0 – 1,6 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01263 |
|
3 x M25 |
YES (1,6 – 2,5 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01272 |
|
3 x M25 |
YES (2,5 – 4,0 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01283 |
|
4 x M25 |
YES (4,0 – 6,3 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01293 |
|
4 x M25 |
YES (6,3 – 10,0 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01303 |
|
4 x M25 |
YES (10,0 – 16,0 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01313 |
|
4 x M25 |
YES (16,0 – 20,0 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01323 |
|
4 x M25 |
YES (20,0 – 25,0 A) |
YES |
YES |
YES |
NO |
YES |
HCS1P 252616 S01333 |
|
GLANDS
|
OVERLOAD PROTECTIONS
|
PHASE LOSS PROTECTION
|
SHORT CIRCUIT PROTECTION
|
THERMAL PROTECTION |
UNDERVOLTAGE PROTECTION |
AUXILIARY CONTACTS NO + NC |
ORDER NUMBER |
|---|---|---|---|---|---|---|---|
|
4 x M25 |
YES (0,1 – 0,16 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01214 |
|
4 x M25 |
YES (0,16 – 0,25 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01224 |
|
4 x M25 |
YES (0,25 – 0,4 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01232 |
|
4 x M25 |
YES (0,4 – 0,63 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01234 |
|
4 x M25 |
YES (0,63 – 1,0 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01244 |
|
4 x M25 |
YES (1,0 – 1,6 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01254 |
|
4 x M25 |
YES (1,6 – 2,5 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01264 |
|
4 x M25 |
YES (2,5 – 4,0 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01274 |
|
4 x M25 |
YES (4,0 – 6,3 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01284 |
|
4 x M25 |
YES (6,3 – 10,0 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01304 |
|
4 x M25 |
YES (10,0 – 16,0 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01314 |
|
4 x M25 |
YES (16,0 – 20,0 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01324 |
|
4 x M25 |
YES (20,0 – 25,0 A) |
YES |
YES |
YES |
YES |
YES |
HCS1P 252616 S01334 |
- Ostania cyfra numeru zamówieniowego:
- 1 – wersja podstawowa bez wyzwalacza podnapięciowego oraz styków pomocniczych
- 2 – wyzwalacz podnapięciowy
- 3 – styki pomocnicze 1N0 + 1 NC
- 4 – wyzwalacz podnapięciowy i styki pomocnicze 1N0 + 1 NC
ATEX Directive requirements for motor connectors
Electric motors used in potentially explosive atmospheres require special protection against overloads and short circuits, as required by the ATEX Directive (2014/34/EU) and the IEC 60079-14 and EN 60079-0 standards.
Hazards affecting motors
Overloads and short circuits can lead to excessive heating of the motor windings, damage to the insulation, as well as arcing and sparking. In the presence of explosive mixtures (gases, flammable liquid vapours or dust), this can lead to an ignition of an explosive atmosphere.
How to select equipment
Any electrical equipment operating in a hazardous area must be designed, selected and installed taking into account the specific requirements resulting from the Ex-zone classification and the equipment category.
Motor switch as the final control element in the drive system
The entire drive system must comply with the temperature class requirements (e.g. T3, T4) and be appropriately sized for the type of zone (0, 1, 2 for gases or 20, 21, 22 for dusts) and explosion group.
Reducing the risk of ignition
These protection measures effectively reduce ignition risk, ensuring safe, reliable, and compliant operation of electric drives in explosive atmospheres.