New Original Siemens 3TK2827-1AL20 Auxiliary Contacts Safety Relay
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New Original Siemens 3TK2827-1AL20 Safety Relay with Auxiliary Contacts
1. Product Overview
The Siemens 3TK2827-1AL20 is a brand-new original safety relay belonging to the SIRIUS 3TK series of industrial safety control components, specially designed for machine safety circuit monitoring and emergency stop protection. It is manufactured in Germany with dual-channel safety architecture, supporting monitoring of emergency stop buttons, safety door switches, light curtains and other safety sensors. This model operates on 24 V DC control supply voltage, equipped with multiple force-guided safety auxiliary contacts for reliable safe disconnection of power circuits under fault conditions. It meets the highest global machinery safety standards, applicable to automated production lines, CNC machine tools, packaging machinery, printing equipment, conveyor systems and robotic workstations. Adopting force-guided contact technology, it can effectively prevent contact welding failures and realize safety classification up to PL e / SIL 3, which is mandatory for high-risk mechanical equipment safety circuits. The modular DIN rail mounting design minimizes cabinet space occupation and simplifies on-site wiring and maintenance.
2. Main Functions
- Dual-Channel Safety Input Monitoring
Supports dual-channel wiring for emergency stop and safety door contacts; continuously detects short circuit, open circuit and cross-fault of sensor cables, triggering safe shutdown once abnormal wiring is identified.
- Force-Guided Safety Auxiliary Contacts
Integrated multiple safety output contacts for cutting off main contactor coils, plus signal feedback auxiliary contacts for PLC fault diagnosis and alarm indication. Force-guided structure ensures all contacts switch synchronously without hidden welding risks.
- Auto & Manual Reset Modes
Two switchable reset modes: Manual reset requires operator to press reset button after safety fault clearance; Automatic reset restores safety output after safety signal recovers, suitable for low-risk equipment with temporary safety trigger.
- Built-in Fault Diagnostic Indicator
Front panel LED status lights separately display power supply status, safety input signal state and fault trip state; maintenance staff can quickly locate wiring breakage, sensor failure or internal relay faults without testing tools.
- Cross-Fault Detection Function
Identifies short-circuit cross connection between two safety input lines, avoiding safety failure caused by external wiring misoperation.
- Extended Safety Chain Compatibility
Can be cascaded with other 3TK series safety relays to form multi-stage safety chains for complex multi-protection zone equipment.
- Anti-Vibration & Industrial Environmental Adaptation
Stable operation under frequent mechanical vibration and dust workshop environments, with built-in surge suppression circuit to resist voltage fluctuation interference.
- Auxiliary Signal Feedback
Independent signaling contact outputs fault trip signals to warning lights, buzzers or upper control systems for real-time safety status upload.
3. Technical Characteristics
表格
| Technical Parameter | Specific Specification of 3TK2827-1AL20 |
|---|---|
| Full Model Code | 3TK2827-1AL20 |
| Control Supply Voltage | 24 V DC |
| Safety Input Channel | 2-channel dual safety input |
| Safety Output Contacts | 3 Normally Open Force-Guided Safety Contacts |
| Auxiliary Signal Contact | 1 Normally Closed Fault Feedback Contact |
| Safety Performance Grade | PL e (ISO 13849-1), SIL 3 (IEC 61508 / IEC 62061) |
| Maximum Sensor Cable Length | 1000 m (twisted shielded cable) |
| Reset Mode | Switchable Manual / Automatic Reset |
| Contact Rated Operational Current (AC-15, 230 V) | 6 A per safety contact |
| Contact Mechanical Service Life | ≥ 10,000,000 switching cycles |
| Electrical Service Life (rated load) | ≥ 100,000 switching cycles |
| Ambient Operating Temperature | -20 °C ~ +60 °C |
| Storage & Transport Temperature | -40 °C ~ +70 °C |
| Protection Class | IP20 (indoor cabinet installation) |
| Mounting Standard | 35 mm standard DIN rail |
| Compliance Standards | IEC 60947-5-1, EN ISO 13849-1, IEC 61508, UL, CSA, CE certification |
| Fault Detection Type | Cable breakage, cross short-circuit, contact fault monitoring |
4. Product Dimension & Weight
4.1 Overall Outer Dimensions
表格
| Dimension Item | Exact Measurement |
|---|---|
| Module Width | 22.5 mm |
| Overall Height | 99 mm |
| Overall Depth | 114 mm |
4.2 Weight Data
- Single unit net weight: 0.16 kg
- Gross weight with original individual carton packaging: 0.23 kg
5. Core Design & Structural Features
- Force-guided safety contact mechanism: All safety contacts are mechanically linked; if one contact welds closed, all other contacts cannot close, eliminating dangerous single-point failure.
- Compact slim 22.5 mm width body: Occupies less DIN rail space compared to wide-body safety relays, supporting dense cabinet layout.
- Detachable screw terminal blocks: Supports solid and stranded copper wire wiring, easy disassembly for wiring modification and equipment overhaul.
- Transparent front status window with multi-color LED indicators: Clear visual identification of power, safety input and fault trip status at a glance.
- Built-in EMC interference suppression circuit: Resists electromagnetic interference from inverters, servo drives and high-power contactors in industrial cabinets.
- Unified SIRIUS series modular design: Compatible with other Siemens low-voltage control components including contactors, circuit breakers and overload relays for integrated starter configuration.
- Yellow safety identification front panel: Consistent with Siemens safety device visual standard, convenient for safety circuit quick recognition by maintenance personnel.
6. List of 10 Similar Functional Siemens 3TK Series Safety Relays
All below products adopt dual-channel safety monitoring, force-guided auxiliary safety contact structure, DIN rail mounting and PL e / SIL 3 safety rating, differing mainly in supply voltage, contact configuration and delay functions for different machine safety demands:
- Siemens 3TK2827-1AB20: 24 V AC supply, 3 NO safety contacts + 1 NC auxiliary contact
- Siemens 3TK2827-1AJ20: 110 V AC supply, dual-channel emergency stop monitoring
- Siemens 3TK2827-1AL21: 24 V DC supply with adjustable 0.5–30 s delayed safety output
- Siemens 3TK2827-1BB40: 230 V AC supply, extended 4 NO safety contact layout
- Siemens 3TK2825-1AL20: Basic type 24 V DC safety relay for single safety door monitoring
- Siemens 3TK2828-1BB40: 230 V AC supply, cascade-capable multi-zone safety chain relay
- Siemens 3TK2840-1BB40: High-current version with 10 A rated safety output contacts
- Siemens 3TK2821-1AL20: Slim basic model for small automation equipment emergency stop
- Siemens 3TK2827-2AL20: Dual-group safety input model for simultaneous safety door + light curtain monitoring
- Siemens 3TK2830-1CB40: Universal wide voltage 24–230 V AC/DC multi-function safety relay
WHO WE ARE
Sobre nosotros
Located in Kunshan, China, Atifts Technology Co., Ltd. is a well-known enterprise specializing in electronic components distribution. We specialize in the sales of global brands of industrial automation components, with a wealth of experience in foreign product agents, and many of the world's leading manufacturers such as Keens, Schneider, SMC, ABB, Siemens, and other world-renowned manufacturers to establish a long-term and stable relations of cooperation.
Atifts Technology Co., Ltd. @ 2024
Over the years, we have always adhered to the "pioneering, pragmatic, standardized, innovative" management philosophy, and constantly promote the close integration of products and market demand. We firmly believe that only by constantly exploring new market areas, doing a good job in every detail, standardizing business processes, and continuously innovating products and services can we ensure that our products are more adaptable to market changes and meet the diversified needs of our customers.
Since the founding of the company, we have always adhered to the core concept of "survival by quality", and are committed to providing customers with high-quality electronic components. At the same time, we take specialized R & D manufacturing as the goal, market-oriented development strategy to ensure that our products are always in the forefront of the industry.
With excellent product quality, professional technical service and good market reputation, Kunshan Autofits Technology Co.,Ltd. has won the trust and support of our customers. We look forward to working with more partners hand in hand, to achieve long-term win-win relationship, and jointly promote the prosperity of the electronic components industry.
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