Ex Range
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Description
The Guardmaster Ex Range of safety switches are specifically designed for potentially explosive atmospheres. They retain the safety features and operating principles of the conventional Guardmaster switches. They incorporate a sealed flameproof contact block, making them suitable for use in European Zone 1 and Zone 2 environments. In the US and Canada, these products can be used in areas classified as Class 1, Division 2 in Groups A (acetylene), B (hydrogen), C (ethylene) and D (propane). All the Guardmaster Ex switches conform to the exacting standards required by the European harmonized standards. The contact block in these switches has the following approvals: 112G EExd IIC T6 or T5 and 11 2D T80°C IP66.
EEx equipment conforms to types of protection standardised by CENELEC (European standards), EN50014 and EN50018 respectively and BS5501 parts 1-V.
The d suffix indicates that the contact block in the switch is a flameproof enclosure and is designed to ensure that if an internal explosion occurs it will be contained with the enclosure. The designation II indicates use in surface industries and c refers to the group of gases for which the switches are suitable. The designation T represents the surface temperature classification of the switch. These switches have been tested with an ambient temperature of 60°C as opposed to the normal test limit of only 40°C, allowing them to be used in gases having a low flash point.
It should be noted that these groups refer to the explosion-proof qualities of the switches and not corrosion-resistance characteristics. Special precautions may be required to protect the vulnerable parts such as PVC-covered cables against attack by certain corrosive elements and physical damage.
Features
- For use in potentially explosive atmospheres
- Positive mode action, flameproof contact block
- Suitable for use in European Zone 1 and 2 environments
- US and Canada: Class 1, Division 2 in Groups A, B, C and D
Specifications
| All switches excluding Ferrogard GS2 | |
| Contact Block Electrical Specifications | |
| Certifications | 112G EExd 11C T6 or T5 112D T80°C IP 66 under ATEX |
| Safety Contacts | 1 N.C. & 1 N.O. or 2 N.C. |
| Enclosure Protection | IP66 |
| Rated Voltage | 250V AC and 250V DC |
| Rated Current | 5 A AC and 0.25 A DC |
| AC Ratings, Resistive | 6 A @ 250V, 6 A @ 125V |
| AC Ratings, Inductive | 2.5 A @ 250V, 3 A @ 125V |
| DC Ratings, Resistive | 0.25 A @ 250V, 0.5 A @ 125V, 1 A @ 75V, 7 A @ 30V |
| DC Ratings, Inductive | 0.1 A @ 250V, 0.2 A @ 125V, 1 A @ 75V, 5 A @ 30V |
| Contact Block Technical Specifications | |
| Operating Force | 1.6 N - 0.4/ - 0.2 N |
| Release Force | 0.4 N |
| Pre-travel | 0.8 mm (0.03 in.) |
| Over Travel | 0.6 mm (0.02 in.) |
| Return Travel | 1.1 mm (0.04 in.) |
| Differential Travel | 0.5 mm (0.19 in.) |
| Release Travel | 0.2 mm (0.007 in.) |
| Positive Break Travel | 0.4 mm (0.01 in.) |
| Repeatability | +0.01 mm (0.0003 in.) |
| Switching Speed, Min. | 1 mm (0.039 in.) |
| Switching Frequency, Max. | 3000 operations/hour |
| Mechanical Life | 2,000,000 operations |
| Electrical Life | Dependent on loading |
| Operating Temperature [C (F)] | -25…70° (-10…284°) |
| Electrical Connection | Potted in leads. Flexible 4 x 0.75 mm2, 2 m long |
| Ferrogard GS2 | |
| Certifications | EExd IIC T6 Baseefa. Not suitable for Group 1 gases |
| Safety Contacts | 1 N.C. |
| Enclosure Protection | IP67 (NEMA 6P) |
| Rated Voltage | 250V AC |
| Rated Current | 2 A |
| Rated VA | 100V A max @ 50V 200V A max @ 110V 500V A max @ 250V |
| Operating Distance, Make [mm (in.)] | 15 (0.59) |
| Operating Distance, Break [mm (in.)] | 26 (1.02) |
| Closing Time | 3.0 ms |
| Drop-Out Time | 2.1 ms |
| Bounce Time | 0.7 ms |
| Shock | <50 g |
| Vibration | 15 g, 20…1000 Hz |
| Contact Resistance, Initial | 0.07 W (excluding cable) |
| Mechanical Life | 100,000,000 operations |
| Electrical Life | 5,000,000 operations |
| Operating Temperature [C (F)] | -10…40° (14…104°) |
| Housing Material | Brass or Stainless Steel |
| Cable Length | 3 m (9.8 ft), 5 m (32.8 ft), or 10 m (32.8 ft) |
| Cable Type | Termorad |
Product Selection
| Switch | Description | Type | Safety Contacts | Cable Length | Cat. No. |
|
Ex Trojan 5. Explosion proof tongue operated safety interlock switch. | Trojan 5-EX | 2 N.C. | 2 m (6.5 ft) | 440K-H11145 |
| 6 m (19.7 ft) | 440K-H11160 | ||||
| 15 m (39.2 ft) | 440K-H11161 | ||||
|
Ex Ferrogard GS2. Explosion proof magnetically actuated, noncontact safety interlock switches. | GS2-Ex (stainless steel) | 1 N.C. | 3 m (9.8 ft) | 440N-H02047 |
| Ferrogard GS2-EX (stainless steel) | 10 m (32.8 ft) | 440N-H02087 | |||
|
Ex Lifeline 4. Explosion proof, cable and push button actuated Emergency Stop switch. | Lifeline 4-EX | 1 N.C. & 1 N.O. | 2 m (6.5 ft) | 440E-H13046 |
| 2 N.C. | 440E-H13069 | ||||
|
Ex Rotacam. Explosion proof, hinge actuated safety interlock switch. | Rotocam-HS-2-EX | 1 N.C. & 1 N.O. | 440H-H03077 | |