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Siemens 3WL1N16-1600A ETU45B-G-LCD-3P is a low-voltage air circuit breaker manufactured by Siemens.
Product Type: It belongs to the 3WL series air circuit breakers and can be used as incoming line, bus tie and feeder circuit breakers in electrical systems for industrial, building and infrastructure applications.
Model Interpretation: In the model 3WL1N16, “3” represents the product series code, “WL1” indicates the No.1 specification of the 3WL series, “N” usually denotes the standard type, and “16” means the frame size current is 1600A; “1600A” is the rated current of the circuit breaker; “ETU45B” refers to the model of the electronic trip unit; “G” signifies the ground fault protection function; “LCD” means it is equipped with a liquid crystal display; “3P” indicates that the circuit breaker is three-pole.
Technical Features:
Comprehensive Protection Functions: It provides overload protection, short-circuit protection, ground fault protection and other functions. The overload protection L (long-time protection) of the electronic trip unit ETU45B allows switching characteristic curves between I²t and I⁴t, and the monitoring function I⁴t characteristic improves the selectivity with downstream circuit breakers and fuses.
Communication and Data Acquisition: It has communication capabilities and can transmit data such as current values, switch status and trip causes to the central computer via standard PROFIBUS DP or MODBUS. It can also cooperate with the Plus measurement function to realize energy data acquisition, facilitating remote monitoring and energy management.
High Adjustability: Protection functions can be set through rotary coding switches or slide switches, and parameters such as overload protection time-delay levels, and characteristic curves of overload and short-time delay short-circuit ranges can be adjusted according to actual requirements.
Display Function: Equipped with an LCD display, it can clearly show trip status, trip causes and other information, which is convenient for fault diagnosis and equipment maintenance.
Appearance and Installation: Adopting a modular design, it is easy to maintain and modify. It can be installed by means of screw mounting or DIN rail mounting, and can be conveniently integrated into electrical systems.
Dimensions of Siemens 3WL1N16-1600A ETU45B-G-LCD-3P
> Note: The model “33WL1N16” is likely a typo; the correct model should be 3WL1116 (Frame Size I) or 3WL1216 (Frame Size II) 1600A 3P ETU45B-G-LCD. In the correct model, “16” indicates a frame size current of 1600A, “3P” means three-pole, and “ETU45B-G-LCD” represents the electronic trip unit ETU45B with ground fault protection (G) and liquid crystal display (LCD).
- Core Dimension Parameters (Unit: mm)
1.1 Frame Size I (3WL1116 Series)
| Mounting Method | Width (W) | Height (H) | Depth (D) | Remarks |
| Fixed Type | 320 | 434 | 291 | Standard depth, excluding the protruding part of the operating mechanism |
| Drawout Type | 320 | 434 | About 450 | Including the depth of the drawer base, subject to accessory configuration |
1.2 Frame Size II (3WL1216 Series)
| Mounting Method | Width (W) | Height (H) | Depth (D) | Remarks |
| Fixed Type | 460 | 434 | 291 | Standard depth, excluding the protruding part of the operating mechanism |
| Drawout Type | 460 | 434 | About 450 | Including the depth of the drawer base, subject to accessory configuration |
1.3 Key Supplementary Instructions
- Height Consistency: The standard height of all 3WL series circuit breakers (Frame Size 0/I/II/III) is 434mm, which is the unified design standard of this series.
- Depth Difference:
The basic depth of the fixed type is 291mm (Frame Size I/II).
The depth of the drawout type increases by about 160mm (thickness of the drawer base).
If equipped with an extended operating mechanism or other special accessories, the depth may increase further.
- Impact of ETU45B-G-LCD: The type of electronic trip unit (ETU45B) and display mode (LCD) have no significant impact on the overall dimensions, and only affect the layout of the front panel of the circuit breaker.
- Mounting Hole Dimensions:
Frame Size I: Recommended mounting hole width is 310mm and height is 424mm.
Frame Size II: Recommended mounting hole width is 450mm and height is 424mm.
Mounting Spacing: It is recommended to reserve a heat dissipation space of ≥50mm between adjacent circuit breakers.
- Weight Reference
| Model Series | Mounting Method | Weight (kg) | Remarks |
| 3WL1116 | Fixed Type | About 45 | Including ETU45B trip unit |
| 3WL1116 | Drawout Type | About 55 | Including drawer base and ETU45B trip unit |
| 3WL1216 | Fixed Type | About 56 | Including ETU45B trip unit |
| 3WL1216 | Drawout Type | About 65 | Including drawer base and ETU45B trip unit |
- Dimension Selection Recommendations
- Frame Size Selection:
Frame Size I (3WL1116): Breaking capacity is 55kA, suitable for conventional industrial and building power distribution applications.
Frame Size II (3WL1216): Breaking capacity is 66/80/100kA, suitable for occasions with higher requirements for breaking capacity.
- Mounting Method Selection:
Fixed Type: Small space occupation and low cost, suitable for occasions where frequent maintenance is not required.
Drawout Type: Easy to maintain and replace, suitable for key circuits, but occupies more space.
Model Comparison Table of Siemens 3WL1N16-1600A ETU45B-G-LCD-3P with Other Brands
> Note: The model “33WL1N16” is a typo; the correct model should be 3WL1116 (Frame Size I) or 3WL1216 (Frame Size II) 1600A 3P ETU45B-G-LCD.
- Model Clarification and Core Parameters
| Parameter Item | Specification Value | Description |
| Product Series | Siemens SENTRON 3WL | Air circuit breaker |
| Rated Current | 1600A | Frame size current is 1600A |
| Pole Number | 3P | Three-pole |
| Trip Unit | ETU45B-G-LCD | Electronic trip unit with LSIG protection (Overload L, Short-circuit S, Instantaneous I, Ground fault G) and LCD display |
| Breaking Capacity | 3WL1116: 55/66kA | Different breaking capacities for Frame Size I/II |
| 3WL1216: 80/100kA | ||
| Mounting Method | Fixed/Drawout | Optional |
| Rated Voltage | 690V AC | 50/60Hz |
- Comparison of Corresponding Models and Parameters of Mainstream Brands
| Brand | Corresponding Model | Frame Size | Rated Current | Trip Unit Type | Protection Function | Breaking Capacity | Mounting Method | Remarks |
| Siemens | 3WL1116-3EG45-4GA4 | I/II | 1600A | ETU45B-G-LCD | LSIG (L: Long-time delay, S: Short-time delay, I: Instantaneous, G: Ground fault) | I: 66kA | Fixed/Drawout | Original model with communication and measurement functions |
| 3WL1216-3EG45-4GA4 | II: 80kA | |||||||
| ABB | Emax2 E2N1600 R1600 PR121/P-LSIG-LCD-3P | S2 | 1600A | PR121/P-LSIG-LCD | LSIG, with energy management and fault recording | 65kA | Fixed/Drawout | Compatible with PROFIBUS DP, measurement accuracy class 0.2 |
| Schneider Electric | Masterpact MTZ2 16H2 Micrologic 5.0A-LCD-3P | 1600A | 1600A | Micrologic 5.0A-LCD | LSIG, with energy metering and event recording | 100kA | Fixed/Drawout | New generation MTZ2 series with higher breaking capacity |
| Chint | NA1-2000X-1600M/3P LSIG-LCD | 2000A | 1600A | M-type intelligent controller-LCD | LSIG, with RS485 communication and harmonic analysis | 65kA | Fixed/Drawout | Cost-effective domestic alternative with abundant accessories |
| Delixi | CDW3-2000N-1600M/3P LSIG-LCD | 2000A | 1600A | MT-LSIG-LCD | LSIG, with fault diagnosis and remote control | 60kA | Fixed/Drawout | Technical cooperation with Schneider Electric, stable performance |
| Changshu Switchgear | CW1-2000/1600A 3P LSIG-LCD | 2000A | 1600A | Intelligent trip unit-LCD | LSIG, with overvoltage/undervoltage protection | 65kA | Fixed/Drawout | Well-known domestic brand with high cost performance |
- Detailed Comparison and Analysis of Key Parameters
3.1 Protection Function Comparison
| Brand | Trip Unit Model | Overload Protection | Short-circuit Protection | Ground Fault Protection | Special Functions |
| Siemens | ETU45B | I²t/I⁴t selectable, adjustable from 0.4-1In | Short-time delay 0.1-0.4s, instantaneous 2-10In | Adjustable from 0.2-0.8In | Communication (PROFIBUS/MODBUS), energy data acquisition |
| ABB | PR121/P | Inverse time/definite time selectable | Short-time delay 0.05-0.5s, instantaneous 2-15In | Adjustable from 0.1-0.5In | Pre-alarm function, fault location, maintenance reminder |
| Schneider Electric | Micrologic 5.0A | Thermal memory function, I²t characteristic | Short-time delay 0.05-1s, instantaneous 2-15In | Adjustable from 0.1-0.5In | Power quality analysis, 100 event records |
| Chint | M-type | Inverse time characteristic, adjustable from 0.4-1In | Short-time delay 0.1-0.4s, instantaneous 2-10In | Adjustable from 0.2-0.8In | Harmonic monitoring, remote control and parameter setting |
| Delixi | MT-type | Inverse time characteristic, adjustable from 0.4-1In | Short-time delay 0.1-0.4s, instantaneous 2-10In | Adjustable from 0.2-0.8In | Fault self-diagnosis, historical record inquiry |
3.2 Mechanical and Electrical Life Comparison
| Brand | Mechanical Life | Electrical Life | Operating Frequency |
| Siemens | 150,000 operations | 10,000 operations (AC-3) | 300 operations/hour |
| ABB | 150,000 operations | 10,000 operations (AC-3) | 300 operations/hour |
| Schneider Electric | 150,000 operations | 10,000 operations (AC-3) | 300 operations/hour |
| Chint | 100,000 operations | 8,000 operations (AC-3) | 200 operations/hour |
| Delixi | 100,000 operations | 8,000 operations (AC-3) | 200 operations/hour |
3.3 Dimension and Installation Compatibility Comparison
| Brand | Width (mm) | Height (mm) | Depth (mm) | Mounting Method | Compatibility |
| Siemens 3WL1116 | 320 | 434 | 291 (Fixed) / 450 (Drawout) | 35mm DIN rail / Screw mounting | Compatible with 3WA series |
| ABB Emax2 | 320 | 430 | 285 (Fixed) / 445 (Drawout) | Screw mounting | Compatible with Emax series |
| Schneider Electric MTZ2 | 320 | 430 | 290 (Fixed) / 455 (Drawout) | Screw mounting | Compatible with MT series |
| Chint NA1 | 320 | 430 | 290 (Fixed) / 450 (Drawout) | Screw mounting | Compatible with NA1 series |
| Delixi CDW3 | 320 | 430 | 290 (Fixed) / 450 (Drawout) | Screw mounting | Compatible with CDW3 series |
- Alternative Selection Recommendations
- Original Replacement: The Siemens 3WL series has been gradually upgraded to the 3WA series (e.g., 3WA1116-3EG45-4GA4), which maintains the same installation dimensions and protection functions with higher intelligence.
- Brand Replacement Priority:
High-end industrial applications: Priority should be given to ABB Emax2 or Schneider Electric MTZ2, which have better breaking capacity and communication functions.
Buildings and infrastructure: Choose Chint NA1 or Delixi CDW3 for high cost performance and low maintenance costs.
Projects with limited budgets: Choose Changshu Switchgear CW1 for stable performance and affordable price.
- Key Selection Notes:
Ensure that the breaking capacity ≥ the maximum short-circuit current of the system (a 20% margin is recommended).
The protection function of the trip unit matches the load type (LSIG is required for motor loads, and LSI is optional for distribution loads).
The installation dimensions match the existing cabinet space to avoid cabinet modification.
The communication protocol is compatible with the monitoring system (PROFIBUS/MODBUS/Ethernet).
- Summary
Siemens 3WL1116/3WL1216 1600A ETU45B-G-LCD-3P is a mature and reliable air circuit breaker, and all mainstream brands have alternative models with equivalent performance. During selection, comprehensive consideration should be given to application scenarios, budgets and system requirements to ensure that the protection functions, breaking capacity and installation compatibility meet the needs.
