ABB jshd4-2-ah-a Enabling Switch

Why Choose the ABB JSHD4-2-AH-A 2TLA019995R0900 Enabling Switch?

The ABB JSHD4-2-AH-A 2TLA019995R0900 is an ergonomic three-position safety enabling switch designed for controlled machine operation when an operator needs to work within or close to a hazardous area. Part of the ABB Jokab Safety JSHD4 range, it provides an operator-controlled enabling function for tasks such as troubleshooting, test running, programming, commissioning and machine adjustment.

The JSHD4 three-position operating principle permits machine operation only while the main actuator is deliberately maintained in its centre enabled position. Releasing the actuator or pressing it fully into the third position changes the enabling contacts so the connected safety system can stop or inhibit hazardous movement. The JSHD4-2 top section also incorporates LED indication, a front push-button and a top push-button, providing additional machine control and signalling functions directly from the handheld device.

The JSHD4-2-AH-A combines this multifunction top section with an AH bottom section featuring a cable gland and PCB with 10 screw connections. It additionally incorporates an anti-tamper PCB, providing supervision intended to help prevent manipulation of the enabling function. This combination makes the device particularly suitable for permanent or cabled machine installations requiring comprehensive enabling, auxiliary control and anti-tamper functionality.

Key Advantages

• Ergonomic three-position enabling device for controlled machine operation in hazardous areas.
• Machine enabling occurs only while the operator deliberately maintains the permitted centre position.
• Releasing or fully depressing the actuator changes the enabling contacts so the safety system can initiate a safe response.
• Integrated front and top push-buttons provide additional operator control functions.
• Integrated LED indication provides convenient local machine or process status feedback.
• Cable gland and PCB with 10 screw connections provide flexible hard-wired installation.
• Integrated anti-tamper PCB provides additional supervision of the enabling device.
• Suitable for safety systems requiring performance up to PL e and Category 4 when correctly integrated.

Key Features

• ABB Jokab Safety JSHD4 three-position enabling switch.
• JSHD4-2 top section with LED indication, front push-button and top push-button.
• AH bottom section with cable gland.
• PCB with 10 screw connections for hard-wired installation.
• Integrated anti-tamper PCB.
• Three operating positions: released, enabled and fully depressed.
• Dual-channel enabling contact arrangement.
• Two changeover contact circuits for the three-position enabling function.
• Integrated red and green LED indication.
• Separate top and front auxiliary push-button functions.
• Safety capability up to PL e.
• Safety Category up to Category 4 according to ISO 13849-1.
• Ergonomic handheld construction for machine setup and maintenance operations.

Three-Position Enabling Control with Anti-Tamper Supervision

Three-position enabling switches are used when authorised personnel need controlled machine movement while carrying out work that requires access to a hazardous machine area. With the ABB JSHD4-2-AH-A, the main actuator must be deliberately held in its centre position for the enabling condition to be maintained. Releasing the device or gripping it fully changes the enabling contact state, allowing the connected safety system to stop hazardous machine movement.

The JSHD4-2-AH-A adds considerable functionality to this basic enabling principle through top and front push-buttons, red and green LEDs and an anti-tamper PCB. Its cable-gland entry and 10 screw connection PCB are designed for hard-wired installation, while the anti-tamper circuitry provides an additional means of supervising the enabling device. This makes the model particularly suitable for machine setup, teaching, commissioning and maintenance applications where both auxiliary operator controls and enhanced supervision are required.

Typical Applications

• Machine troubleshooting and fault finding.
• Test running of industrial machinery.
• Machine programming and teaching operations.
• Commissioning and setup procedures.
• Maintenance requiring controlled machine movement.
• Adjustment of automated production equipment.
• Robot and automation cell setup activities.
• Applications requiring anti-tamper supervision of an enabling device.
• Hard-wired operator stations requiring additional push-buttons and LED indication.