Introduction to the Siemens 5SY6216-7
The Siemens 5SY6216-7 is a high-performance miniature circuit breaker (MCB) from the renowned SENTRON protection device family. Specifically, it’s a 2-pole, 16 Ampere MCB with a C-type tripping characteristic. Its primary role in any electrical panel is to provide reliable protection against overcurrents (overload) and short-circuits, safeguarding both equipment and personnel.
The Siemens 5SY6216-7 is a 2-pole miniature circuit breaker (MCB) rated for 16A with a C-type trip curve. It is designed to protect electrical circuits in AC systems up to 400V against overload and short-circuits, commonly used for general-purpose loads like lighting and socket outlets with moderate inrush currents.
Core Features Decoded
For an engineer, the part number itself tells a story. Let’s break down what makes the 5SY6216-7 suitable for specific applications:
- 2-Pole (2P): This configuration allows it to simultaneously disconnect both lines in a single-phase system (e.g., L + N in some regions) or two phases in a multi-phase system, ensuring complete circuit isolation.
- 16A Rated Current: It can safely carry up to 16 amps of continuous current. Any sustained current above this will cause the thermal trip mechanism to activate.
- C-Type Tripping Curve: This is the most critical specification for application engineering. A C-curve breaker is designed to trip magnetically between 5 to 10 times its rated current (80A to 160A for this model). This makes it the standard choice for most commercial and residential applications, as it tolerates the moderate inrush currents of fluorescent lighting, small motors, and general socket circuits without nuisance tripping, while still providing robust short-circuit protection.
Technical Specifications: 5SY6216-7
| Specification | Value |
|---|---|
| Manufacturer | Siemens |
| Part Number | 5SY6216-7 |
| Product Series | SENTRON 5SY6 |
| Number of Poles | 2 P |
| Rated Current (In) | 16 A |
| Tripping Characteristic | C |
| Rated Voltage (AC) | 400 V |
| Rated Voltage (DC) | 60 V per pole |
| Breaking Capacity (Icn) at 400V AC | 6 kA (acc. to EN/IEC 60898-1) |
| Energy Limiting Class | 3 |
| Mounting Type | DIN Rail (TH 35) |
| Terminal Type | Screw terminals |
| Mechanical Service Life | 10,000 switching cycles |
Do not substitute a C-curve breaker where a B-curve is specified. The 5SY6216-7 (C-Curve) is not suitable for applications with very low inrush current or long cable runs where touch voltage protection is critical. Using it in place of a more sensitive B-curve breaker can result in delayed tripping under fault conditions, posing a significant safety risk.
Installation & Sourcing
The 5SY6216-7 mounts on a standard 35mm DIN rail. Its dual-position DIN rail clip allows for easy installation or removal from a busbar system without needing to disturb adjacent devices. When sourcing a replacement or specifying for a new panel, ensuring you have the exact part number is crucial for maintaining the installation’s integrity and safety certifications. You can 🛒 Check Price & Stock for the Siemens 5SY6216-7 to confirm current availability.
Frequently Asked Questions
What is the main difference between this 5SY6216-7 (C-Curve) and a B-Curve MCB?
The primary difference is the instantaneous trip current. A B-curve breaker trips between 3-5 times its rated current, making it more sensitive and ideal for protecting purely resistive loads (like heaters) and circuits with long cable runs. A C-curve breaker (like the 5SY6216-7) trips between 5-10 times its rated current, making it suitable for general-purpose loads with moderate startup currents, such as lighting and standard power outlets.
Can the 5SY6216-7 be used in a DC electrical system?
Yes, but with limitations. According to Siemens’ specifications for the 5SY series, this breaker is rated for DC applications up to 60V per pole. For a 2-pole breaker, this means it can be used in systems up to 120V DC. It’s crucial to consult the official datasheet for the specific breaking capacity at different DC voltages, as it differs from the AC rating.
What does the ‘6 kA’ breaking capacity signify?
The 6 kA (kiloamperes) breaking capacity is the maximum prospective short-circuit current that the MCB can safely interrupt without being damaged or causing a hazard. This 6kA rating is common for commercial and light industrial applications. For heavy industrial environments with higher potential fault currents, breakers with a 10 kA or higher rating would be required.
