Siemens 3TK2828-1AL20 SIRIUS Safety Relay
Warranty: 1 year
Condition : brand new in factory sealed box
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Detail
- Product NameSiemens 3TK2828-1AL20 SIRIUS Safety Relay
- Item NO.3741905
- Weight0.6200 kg = 1.3669 lb = 21.8699 oz
- CategoryPLC
- BrandSiemens
- Creation Time2026-08-20
3TK2828-1AL20
Overview
3TK2828-1AL20 is a safety relay from Siemens' SIRIUS 3TK28 series, designed for monitoring protective doors and safety-related circuits in industrial environments. It provides reliable safety function with both instantaneous and time-delayed relay enabling circuits.
The device features 2 NO instantaneous enabling contacts and 2 NO time-delayed enabling contacts (0.5...30 s), plus 1 NC signaling contact. It is designed for 230 V AC control supply voltage, uses screw-type terminals, and supports automatic start configuration.
The 3TK2828-1AL20 achieves SIL 3 (IEC 61508/EN 62061), Performance Level e (PL e) (ISO 13849-1) for instantaneous enabling circuits, and Category 4 (EN ISO 13849-1), making it suitable for high-demand safety applications. Its cross-circuit proof design and positively-driven contacts ensure fail-safe operation.
- Siemens SIRIUS 3TK28 Series
- 2 NO instantaneous enabling contacts
- 2 NO time-delayed enabling contacts
- 1 NC signaling contact
- 230 V AC control supply
Specifications
Electrical & performance
| Manufacturer | Siemens |
| Model | 3TK2828-1AL20 |
| Series | SIRIUS 3TK28 |
| Product type | Safety Relay (Basic Unit) |
| Control supply voltage | 230 V AC (50/60 Hz) |
| Enabling contacts (NO) | 2 instantaneous + 2 delayed (0.5...30 s) |
| Signaling contacts (NC) | 1 |
| Rated insulation voltage | 300 V |
| Surge voltage resistance | 4,000 V |
| Power loss (max) | 2.5 W |
| Max switching frequency | 1,000 operations/hour |
| Electrical endurance (typical) | 100,000 operating cycles |
Physical & environmental
| Mounting | Screw and snap-on mounting (35mm DIN rail) |
| Width | 45 mm |
| Height | 120 mm |
| Depth | 138.5 mm |
| Protection class (enclosure/terminals) | IP20 / IP20 |
| Degree of pollution | 3 |
| Operating temperature | -25°C to +60°C |
| Storage temperature | -40°C to +80°C |
| Terminals | Screw-type |
| Shock resistance | 8 g / 10 ms |
| Vibration resistance | 5...500 Hz: 0.075 mm |
Features
Safety & monitoring functions
- Protective door monitoring — Designed specifically for protective door monitoring, ensuring safe access to hazardous areas.
- Multi-sensor compatibility — Supports monitoring of position switches, safety switches, magnetic switches, floating sensors, and safety-related circuits.
- Cross-circuit proof design — Detects cross-circuits in the safety circuit, improving system safety and reliability.
Diagnostics & configuration
- Time-delayed enabling contacts — Provides two time-delayed enabling contacts with adjustable delay time from 0.5 to 30 seconds, enabling controlled stopping sequences.
- LED status indication — Five LEDs (POWER, CHANNEL 1, CHANNEL 2, CHANNEL 1 (t), CHANNEL 2 (t)) provide visual indication of operating state and fault conditions.
- Automatic start — Supports automatic start configuration for simplified machine operation.
Applications
The 3TK2828-1AL20 is widely deployed in safety-critical industrial applications requiring time-delayed enabling circuits.
Lifecycle
Phased-out no longer in active production — limited availability
Product status: The 3TK2828-1AL20 has been phased-out by Siemens and is no longer in active production. It may still be available through surplus stock or authorized distributors as a legacy spare part for existing systems.
Spare parts & support: Replacement units and accessories are available through Siemens' standard support channels and authorized distributors, but availability may be limited. For new installations, the successor solution is strongly recommended.
Replacement & migration:
- The 3SK2 series offers enhanced functionality including higher switching frequencies and improved diagnostics.
- When replacing the 3TK2828-1AL20 with the 3SK2 successor, verify the control supply voltage and application requirements to ensure compatibility.
- The 3SK2 series is designed for long-term availability and continued support.
Recommendation: For new installations, we strongly recommend the successor solution 3SK1121-1CB42 + 3SK1230-1AW20. For existing systems, procuring spare units while available is advisable.
FAQ – Frequently Asked Questions
No. Siemens has phased out this product and it is no longer in active production. For new installations, the preferred successor is 3SK1121-1CB42 + 3SK1230-1AW20.
It achieves SIL 3 (IEC 61508), Performance Level e (PL e) for instantaneous enabling circuits, PL d for delayed enabling circuits, and Category 4 (EN ISO 13849-1).
The two time-delayed enabling contacts (0.5...30 s) enable controlled stopping sequences, such as safe speed reduction before allowing access to hazardous areas.
It operates on 230 V AC (50/60 Hz) control supply voltage.
Yes, it features cross-circuit proof design with a minimum fault current of 0.5 A, ensuring detection of cross-circuits in the safety circuit.
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