Machine Safety Solution – TESCH F12304 | Safety Relay Series
The TESCH F12304 is a dual-channel safety relay module engineered for emergency stop (E-stop) circuits, safety gate monitoring, and light curtain integration in industrial machinery. Designed to meet the highest functional safety standards, it delivers reliable, repeatable safe-state switching for Category 4 / PLe applications per EN ISO 13849-1.
Where This Product Is Used
- Automotive Assembly Lines – Guards robotic welding cells and stamping presses; trips safe state within milliseconds of E-stop activation.
- Packaging Machinery – Monitors interlocked safety doors on form-fill-seal and cartoning equipment to prevent access during hazardous motion.
- CNC Machining Centers – Interfaces with two-hand control devices and light curtains to enforce operator presence before spindle restart.
- Conveyor & Material Handling Systems – Provides zone-based E-stop control across multi-drive conveyor networks.
- Collaborative Robot (Cobot) Cells – Integrates with safety-rated I/O to enforce speed-and-separation monitoring boundaries.
- Food & Beverage Processing – Stainless-compatible panel mounting; withstands washdown environments when housed in IP65+ enclosures.
- Pharmaceutical & Chemical Plants – Supports SIL 2 / SIL 3 safety loops in process shutdown systems (ESD/SIS).
Technical Specifications
- Model / SKU: F12304
- Brand: TESCH
- Series: F-Series Safety Relay
- Function: Dual-channel emergency stop & safety gate monitoring
- Safety Category: Category 4 / PLe (EN ISO 13849-1)
- Supply Voltage: 24 V DC (±15%)
- Output Contacts: 3 NO safety outputs + 1 NC auxiliary
- Response Time: ≤ 20 ms
- Reset Mode: Manual monitored / automatic (selectable)
- Housing / Mounting: 22.5 mm DIN rail (EN 60715)
- Operating Temperature: −10 °C to +55 °C
- Protection Class: IP40 (terminal area)
- Weight: 270 g
- Certifications: CE, TÜV, UL (pending verification with datasheet)
Why Engineers Specify This Model
- Dual-channel input architecture detects single-fault conditions and prevents dangerous single-point failures — mandatory for PLe/Cat.4 loops.
- Monitored manual reset prevents automatic restart after an E-stop event, satisfying ISO 13850 requirements for emergency stop functions.
- Compact 22.5 mm footprint maximises panel real estate in space-constrained control cabinets.
- Cross-circuit detection identifies wiring faults between channels before they can mask a hazardous condition.
- Wide supply voltage tolerance (±15%) ensures stable operation on noisy industrial 24 V DC rails.
- DIN rail snap-fit installation reduces commissioning time and simplifies field replacement.
Complete System Bill of Materials
For a fully compliant E-stop safety loop, engineers typically pair the F12304 with:
- Dual-channel E-stop pushbutton (e.g., 40 mm mushroom head, IEC 60947-5-5 compliant)
- Safety-rated cable (shielded, min. 0.75 mm²) for channel wiring
- 24 V DC PELV power supply (EN 60204-1)
- Downstream contactors or safe-torque-off (STO) drive inputs
- DIN rail, end stops, and terminal blocks (e.g., 4 mm² screw or spring-cage)
- Safety PLC or safety I/O module for higher-level SIS integration (optional)
Compliance & Industry Standards
- EN ISO 13849-1:2015 – Safety of machinery, control system design (PLe / Cat.4)
- IEC 62061 – Functional safety of E/E/PE safety-related systems (SIL 2/3)
- ISO 13850 – Emergency stop function principles
- EN 60204-1 – Electrical equipment of machines
- IEC 60947-5-1 – Low-voltage switchgear and controlgear
- CE Marking – EU Machinery Directive 2006/42/EC
Quality Assurance & Sourcing
Konmask.com sources the TESCH F12304 exclusively through authorised distribution channels and verified industrial surplus networks. Every unit undergoes incoming inspection including:
- Visual inspection for label authenticity and housing integrity
- Date-code and batch traceability verification
- Functional continuity check on all output contacts
- Anti-static packaging and climate-controlled storage prior to dispatch
Counterfeit safety components represent a critical risk. We provide documentation of origin upon request for safety-critical procurement.
How to Source This Part
- In-stock orders: Add to cart and check out — ships within 1–3 business days from our warehouse.
- Bulk / project quantities: Contact [email protected] for volume pricing and lead-time confirmation.
- Urgent / AOG requirements: Call +0086 19859288691 for same-day quotation and expedited dispatch options.
- OEM / system integrator accounts: Ask about our B2B wholesale catalogue and NET payment terms.
Application-Specific FAQ
Q: Can the F12304 be used with a single-channel E-stop button?
A: No. Single-channel wiring reduces the achievable safety category to Cat.2 / PLd at best. For PLe/Cat.4 compliance, both input channels must be wired independently to separate contacts of the E-stop device.
Q: Does the F12304 support automatic reset?
A: Yes — reset mode is selectable. However, automatic reset is only permissible where a risk assessment confirms no hazard exists upon restart. Monitored manual reset is recommended for most machinery applications.
Q: What is the maximum cable length between the E-stop button and the relay?
A: TESCH does not specify a hard maximum, but capacitive loading on long cable runs can affect response time. Keep runs under 100 m and use shielded cable; consult the datasheet for detailed guidance.
Q: Is the F12304 compatible with OSSD outputs from light curtains?
A: The F12304 accepts dry-contact inputs. For OSSD (PNP semiconductor) outputs from light curtains or laser scanners, an OSSD-compatible safety relay or safety controller input is required.
Q: Can multiple F12304 relays be cascaded for zone control?
A: Yes. The auxiliary NC output can be used to cascade into a second safety relay for multi-zone E-stop architectures, provided the overall PL/SIL calculation accounts for the series connection.
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