ABB MS116-16 1SAM250000R1011 Maintenance-Proven Spare Part

Overview

ABB MS116-16 1SAM250000R1011 Maintenance-Proven Spare Part for Factory Uptime

The ABB MS116-16 (catalog number 1SAM250000R1011) is a 3-pole manual motor starter and protection circuit breaker from ABB’s MS116 series, rated for 10–16 A motor load currents. Designed for direct-on-line motor protection in industrial control panels, this device combines overload and short-circuit protection in a compact DIN-rail-mount package. Holding a pre-tested, in-stock unit of the MS116-16 in your spare parts inventory is a proven strategy for minimizing unplanned downtime in motor-driven production lines, conveyor systems, pump stations, compressor banks, and HVAC plant rooms.

For maintenance engineers managing aging ABB motor control centers (MCCs) or legacy low-voltage switchgear, the MS116-16 is a direct, plug-compatible replacement that requires no firmware update, no bus configuration, and no panel re-wiring when the original unit fails. Its bimetal thermal-magnetic trip mechanism is factory-calibrated and ships ready for immediate installation, reducing mean time to repair (MTTR) to the time it takes to swap the device and re-energize the circuit.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

When a motor protection circuit breaker such as the MS116-16 trips or fails in service, the fault is rarely isolated to the breaker alone. A disciplined maintenance engineer will use the replacement event as an opportunity to inspect the entire motor starter circuit and adjacent components before re-energizing the load.

Begin with the ABB A-line contactor (typically an A9, A12, or A16 paired with the MS116 in a direct-on-line starter combination) — check the main contact wear, coil resistance, and auxiliary contact function. Inspect the 24 VDC or 230 VAC control power supply feeding the contactor coil circuit; a degraded power supply can cause nuisance trips or coil burnout that stresses the upstream breaker. Verify the terminal blocks (e.g., ABB SAKB or Phoenix Contact UK series) for loose connections, discoloration, or carbonization that may indicate sustained overload conditions.

Check the motor cable insulation resistance with a 500 V megger before reconnecting — a ground fault in the cable is a common root cause of repeated MS116 trips. If the starter circuit includes an ABB HK1-11 auxiliary contact block mounted on the MS116, verify its switching function and replace it as a set if the main device is being swapped. For applications with remote monitoring, inspect the signal isolator or I/O module receiving the trip signal — an ABB CM-series monitoring relay or a Siemens ET 200SP I/O module in the same cabinet may need its input channel verified after a hard trip event.

Where the MS116-16 protects a motor connected to a variable frequency drive (VFD) bypass circuit, also inspect the bypass contactor, the VFD output filter, and any branch fuse protection (e.g., ABB OFAF or gG-type fuses) in the motor branch circuit. Maintaining a cabinet-level spare kit that includes the MS116-16, a matched A-line contactor, HK1-11 auxiliary contact block, and a set of branch fuses eliminates the most common single points of failure in a motor starter assembly and supports a sub-30-minute restoration time for most motor faults.

Site Replacement Workflow

Step 1 — Isolation and lockout: Open the upstream feeder breaker and apply LOTO (lockout/tagout) per site procedure. Verify absence of voltage on all three phases at the MS116-16 line terminals using a calibrated voltage tester.

Step 2 — Document existing settings: Record the current adjustment dial position (ampere setting) on the failed MS116-16 before removal. Photograph the wiring layout and terminal labeling for reference during reinstallation.

Step 3 — Remove failed unit: Disconnect load and line cables from the MS116-16 terminals. If an HK1-11 auxiliary contact block or shunt trip accessory is fitted, unclip it from the device body before sliding the breaker off the DIN rail.

Step 4 — Install replacement MS116-16 (1SAM250000R1011): Clip the new unit onto the DIN rail. Set the current adjustment dial to the recorded ampere value. Reattach any accessory modules. Reconnect line and load cables to the correct terminals, torquing to the manufacturer’s specified value (typically 2.5–3 Nm for the MS116 series).

Step 5 — Functional verification: With the load disconnected, re-energize the circuit and verify the device closes and holds. Reconnect the motor load and perform a no-load run, monitoring current draw on all three phases. Confirm the trip signal output (if monitored) is in the healthy state before returning the circuit to automatic control.

Step 6 — Update maintenance records: Log the replacement date, new unit serial number, and any observations about the failed device (e.g., contact erosion, trip indicator position) in the site CMMS. Schedule the next inspection interval per the site’s preventive maintenance plan.

Spare Parts Support FAQ

Q1: Is the MS116-16 (1SAM250000R1011) a direct drop-in replacement for an older ABB MS116 unit already installed in my panel?
Yes. The MS116-16 1SAM250000R1011 is the current production catalog number for the 10–16 A variant of the ABB MS116 series. It is dimensionally and electrically compatible with earlier MS116-16 units and accepts the full range of MS116 accessory modules (auxiliary contacts, shunt trips, undervoltage releases, and door-coupling handles) without modification to the panel cutout or wiring.

Q2: How do you verify compatibility before shipment, and what does the support terms confirmed by quotation cover?
Every unit undergoes a pre-shipment functional test including a trip mechanism check and terminal continuity verification. The support terms confirmed by quotation cover manufacturing defects and functional failures under normal operating conditions from the date of shipment. It does not cover damage caused by installation errors, operation outside rated parameters, or physical abuse. Support requests are supported with a replacement unit dispatched from stock — no extended RMA lead time.

Q3: What is the recommended spare parts stocking strategy for the MS116-16 in a facility with multiple motor starters?
For facilities operating 10 or more MS116-series starters, a minimum stock of 2–3 units per current rating band is recommended. Given that the MS116-16 covers the 10–16 A range — a common band for 4–7.5 kW motors — it is typically the highest-turnover variant in a mixed MCC. Pairing each MS116-16 spare with a matched A-line contactor and HK1-11 auxiliary contact block creates a complete starter assembly spare that can be pre-wired and staged for rapid deployment during a planned or emergency outage.

Q4: Can you support long-term or blanket purchase orders for the MS116-16 to secure supply for multi-year maintenance contracts?
Yes. We support long-term supply agreements and blanket POs for the MS116-16 and other ABB MS116 series variants. Multi-region stock is maintained to support both scheduled annual outages and emergency same-week dispatch requirements. Contact our sales team to discuss volume pricing, consignment stock arrangements, and lead-time guarantees for your maintenance program.

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Product Identification

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ABB
ABB

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MS116-16 1SAM250000R1011

Product Family

PLCs & Controllers

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Available on request after model and quantity confirmation

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PLC, PAC and modular controllers

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CPU, rack, power and I/O expansion

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Replacement, cabinet build and maintenance

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