ABB JSHD4-2-AH-A 2TLA019995R0900 is a three-position safety enabling switch with dual enabling contacts, LED indication, front and top push-buttons, a cable gland, 10 screw connections and an integrated anti-tamper PCB for controlled industrial machine operation.
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.
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.
| Manufacturer | ABB |
|---|---|
| Product family | ABB Jokab Safety |
| Series | JSHD4 |
| Model | JSHD4-2-AH-A |
| Article number | 2TLA019995R0900 |
| EAN | 7350024453430 |
| Product type | Three-position safety control enabling device |
| Top section | JSHD4-2 |
| Top-section functions | LEDs, front push-button and top push-button |
| Bottom section | AH |
| Connection method | Cable gland |
| Internal connection | PCB with 10 screw connections |
| Anti-tamper function | Integrated anti-tamper PCB |
| Enabling function | Three-position |
| Enabling contacts | 2 changeover contact circuits |
| LED indication | Red and green |
| Auxiliary controls | Top push-button and front push-button |
| Performance Level | up to PL e |
| Safety Category | Category 4 according to ISO 13849-1 |
| Product net width | 34 mm |
| Product net height | 167 mm |
| Product net depth | 50 mm |
| Product net weight | approximately 0.318 kg |
The ABB JSHD4-2-AH-A is a three-position safety enabling switch designed for controlled machine operation during troubleshooting, programming, test running, commissioning, setup and maintenance when an operator needs access to or close proximity to a hazardous machine area.
The JSHD4-2 top section incorporates a front push-button, a top push-button and LED indication in addition to the main three-position enabling actuator, allowing auxiliary machine control and status functions to be integrated into the handheld device.
The AH configuration uses a cable gland and an internal PCB with 10 screw connections, making it suitable for hard-wired machine installations rather than a detachable external connector arrangement.
The JSHD4-2-AH-A includes an anti-tamper PCB designed to provide additional supervision of the enabling device and help the connected safety system detect conditions associated with manipulation or incorrect operation of the enabling function.
The JSHD4-2-AH-A is specified for applications up to Performance Level e and Safety Category 4 according to ISO 13849-1 when correctly connected, configured and incorporated into an appropriate safety-related control system.
ABB Jokab Safety JSHD4-2-AH-A enabling switches provide ergonomic three-position machine control for troubleshooting, programming, commissioning and maintenance, combining dual-channel enabling contacts with auxiliary push-buttons, LED indication, 10 screw connections and integrated anti-tamper supervision.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...