Keeping pipes, tanks and process lines at the right temperature shouldn’t require a tangle of components, a clipboard of manual checks, or a trip to the field every time a setpoint needs adjusting. RELCON has been at the forefront of heat tracing for decades, and we’re excited to introduce the newest innovation in heat trace control: the Raychem Elexant 3500i Electronic Thermostat.
The Elexant 3500i is a family of compact, full-featured electronic thermostats designed for heat tracing control and monitoring in both freeze protection and process temperature maintenance applications. It’s built to install faster, adapt to your needs, and keep you informed about your system around the clock.
One Platform, Five Variants, Two Mounting Options
Designed from a common hardware platform, the Elexant 3500i offers five variants and two enclosure types (wall mount and pipe mount), giving you the flexibility to tailor the control solution to your exact heat tracing requirements. Whether you need a simple local thermostat with an indicator light or a fully connected controller with load sensing and ground fault detection, there’s a configuration that fits.
Available features include an alarm relay, RS-485 and Bluetooth connections, load sensing, ground fault detection, an automated heat trace system check, and a mobile app for wireless configuration. The Elexant 3500i is suitable for both hazardous and non-hazardous locations.
Why the Elexant 3500i Stands Out
Fast Installation with Minimal Components
- Quick connect terminals deliver fast and secure cable connections.
- Power connection and thermostat in one, supporting up to two heating cables from a single unit.
- Robust wall-mounted or pipe stand enclosures minimize the components and tools required on site.
- Approved to 32 A and 277 Vac, allowing longer heating cable lengths and fewer circuits overall.
Flexible Design. Reliable Performance.
- Five electronic module variants to match your needs, from a local indication light to remote communication, current sensing and ground fault sensing.
- Interchangeable electronic modules make upgrades hassle-free. Start with what you need today and step up later without replacing the enclosure.
- Globally approved for hazardous areas in extreme environments from –55°C to +60°C (–67°F to +140°F).
- A hybrid switching relay (SSR + EMR) rated to 250,000 power cycles for superior product life (IEC 60079).
Interchangeable electronic modules and quick connect terminals simplify installation and upgrades
Connected Operation. Automated Monitoring.
- Bluetooth configuration from a mobile device or tablet using the Elexant Connect App.
- DCS connectivity for remote control and monitoring. Be in full control, anywhere, anytime.
- A 24-hour auto-test provides early warnings and supports predictive maintenance.
- The “Find Me” feature uses Bluetooth to quickly identify and locate a specific Elexant 3500i thermostat in the field.
Make Your Smart Choice in Three Steps
Selecting the right Elexant 3500i is straightforward:
- Choose your enclosure. Select a wall mount or pipe mount model, both built on the same standard modular design.
- Choose your variant. Pick the feature set that matches your application, from Standard through Ground Fault Detecting.
- Upgrade when needed. Swap in a more capable electronic module as your monitoring and control requirements grow.
| Feature | Standard (-ST) | Alarm (-AR) | Communi- cating (-C) | Current Sensing (-I) | Ground Fault Detecting (-GF) |
| Modular Design | ✓ | ✓ | ✓ | ✓ | ✓ |
| Quick Connect | ✓ | ✓ | ✓ | ✓ | ✓ |
| Local Indicator Light | ✓ | ✓ | ✓ | ✓ | ✓ |
| Alarm Relay | ✓ | ✓ | ✓ | ✓ | |
| Temperature Sensors | 1 | 1 | 1 | 2 | 3 |
| Secured Configuration | ✓ | ✓ | ✓ | ||
| Central Communication | ✓ | ✓ | ✓ | ||
| Programmable as a Temperature Limiter | ✓ | ✓ | ✓ | ||
| Auto Test | ✓ | ✓ | |||
| Load Sensing | ✓ | ✓ | |||
| Ground Fault Protection | ✓ |
Key Specifications at a Glance
| Supply Voltage | 100–277 Vac, ±10%, 50–60 Hz |
| Maximum Current | 32 A @ 40°C (104°F), linearly derated to 24 A @ 60°C (140°F) |
| Ambient Operating Temperature | –55°C to +60°C (–67°F to +140°F) |
| Control Temperature Range | Up to +550°C (+1022°F); down to –55°C (–67°F) on -C, -I and -GF variants |
| Enclosure Protection | Type 4X, IP66 |
| Mounting | Wall mount or pipe mount (pipe temperatures up to 205°C / 401°F) |
| Hazardous Area Approval | Class I, Div. 2, Groups A, B, C, D T5; Class II, Div. 2, Groups F, G |
| Communications | RS-485 Modbus RTU (up to 247 thermostats per network); Bluetooth BLE 5.1, encrypted and password protected |
| Ground Fault | GF Alarm or GF Trip at 30 mA or 50 mA, UL 1053 compliant (-GF variant) |
| Switching | Hybrid relay (SSR + EMR) rated to 250,000 power cycles |
| Heating Cable Compatibility | BTV-CR, BTV-CT, QTVR-CT, XTV-CT, XTVR-CT, KTV-CT, HTV-CT, VPL-CT, 2SC-30/40/50 |
Specifications per the Raychem Elexant 3500i datasheet (RAYCHEM-DS-N00406). Refer to the full datasheet for complete details and ordering information.
Part of a Bigger Heat Tracing Picture
The Elexant 3500i doesn’t work in isolation. It can be connected with other Raychem controllers, Raychem Supervisor software, and your central DCS, giving you a complete view of heat tracing across your facility:
- Field controllers and panels: configuration and monitoring via the local user interface or tablet, with integration to your DCS or Raychem Supervisor.
- Data analytics and monitoring: secure data collection and analysis combined with remote monitoring and configuration of heat tracing circuits.
- Connectivity: wired or wireless connection of all components for full heat trace visibility over your entire facility.
- Life cycle services: minimize operational downtime with audits, field support, remote or embedded services, and annual service programs.
Why Partner with RELCON
With over 65 years of continuous family leadership, RELCON brings uninterrupted technical excellence to every heat tracing project. Our goal is to deliver effective solutions to our customers while ensuring dependable service after the sale. Customer service is a priority, and we stand behind both the products we offer and the customers who rely on them.
Ready to upgrade your heat trace control?
Our team can help you select the right Elexant 3500i variant and mounting option, confirm heating cable compatibility, and plan integration with your existing control system.