100-C16D10 Guide: Allen-Bradley Bulletin 100 Contactor Upgrade from 9A

Overview

The 100-C16D10 is a three-pole IEC contactor in the Allen-Bradley Bulletin 100 range, built on the C16 frame rated 16A in AC-3 duty. One frame step above the 9A C09 units, it switches larger motors and feeders on command from a conventional control circuit: the coil pulls the armature in, the main poles close, and spring pressure opens them when the coil drops out. Protection stays a separate job, with an overload relay for the motor and short-circuit protection upstream, which is why a contactor is selected and never adjusted.

In the catalog number, 100 is the Bulletin, C marks the contactor range, and 16 is the 16A frame rating. The characters after the frame, D10, are the coil specification code, and the control voltage behind that code is printed on the coil nameplate and listed in the datasheet. The frame tells you what the contactor can switch. The coil code tells you whether it pulls in on your panel's control supply at all.

Why the step from 9A to 16A comes up

Retrofits grow motors. A machine that came back from a rebuild with a bigger motor, a conveyor carrying more load, a pump moved to a heavier duty point, all of these push the nameplate full-load current past what a 9A AC-3 frame is rated to switch. The C16 frame answers that step, and on the same 35mm DIN rail, so the change is usually a selection exercise rather than a panel redesign.

The exercise still has rules. Full-load current, utilization category, and contact life each get their own check, in that order, and the rest of this page walks them. Skip one and the contactor either fails early or sits in the panel as the wrong part wearing a bigger label.

The C16 frame, line by line

Frame data first, since every later check references it. Values that depend on the coil code, the supply voltage, or the fitted accessories point to the datasheet and the nameplate on the housing.

• Rated current: 16A in AC-3 utilization, the motor-starting duty class
• Typical motor duty: 7.5kW class at common 400V supplies; kW and HP per voltage from the datasheet tables
• Main poles: 3, normally open
• Coil specification: code D10; control voltage per the nameplate and datasheet
• Auxiliary contacts: extended with side-mount adder blocks; arrangements per datasheet
• Terminal marking: IEC convention, coil at A1 and A2, main poles at 1/2, 3/4, and 5/6
• Mounting: latch-on to 35mm DIN rail, or panel screws
• Companion protection: overload relay matched to the motor full-load current, short-circuit device per the datasheet coordination tables

C09 next to C16

The two frames slot into the same panels and the same control schemes, and the differences concentrate in the numbers. This table holds the two side by side for the upsize decision.

Warning: Disconnect and lock out every supply before wiring, both the load circuit at the main poles and the control circuit at the coil. Two sources feed one housing, and both can hurt. Wiring belongs to qualified personnel.

The upsizing check, in order

Run the checks as a sequence and the decision makes itself. Each step either passes or names the next thing to verify.

1. Read the motor nameplate full-load current. That single number drives every later step, so take it from the motor, never from a parts list or a memory.
2. Confirm the utilization category. AC-3 covers motor starting with the contacts breaking running current, AC-1 covers resistive loads, and a duty that mixes both reads as the harder class.
3. Check the current against the frame, with duty in mind. Nameplate full-load current within 16A passes, and frequent starts, jogging, or plugging add wear that argues for margin rather than for riding the limit.
4. Re-check the short-circuit device. The coordination tables in the datasheet name the fuse or breaker types for the C16 frame, and the row differs from the C09 row.
5. Verify the panel and the wiring. Rail length for the larger housing, conductor size and terminal torque from the mounting sheet, and any adder blocks fitted before the power wiring goes on.
6. Keep the overload matched to the motor. An overload relay is set by motor full-load current, so it travels with the motor, whichever frame ends up switching it.

What you see, what it means, what to measure

Failures after an upsize sort into three groups: the contactor doing its job at the new current, the contactor wearing faster than expected, and the parts around the contactor still set for the old motor. The table pairs the observation with the usual cause and the measurement that settles it.

Contact life on an IEC contactor is a wear item, and the duty class defines the wear rate. AC-3 breaks motor running current all day, and a machine cycled every thirty seconds consumes its contacts far faster than one started twice a shift. When the symptom table points at duty rather than at a fault, the fix is on the selection side, in a soft starter or a drive, rather than in another contactor of the same frame.

FAQ

Is upsizing a contactor a free safety margin?

Partly. Contacts running below their rating run cooler and last longer, and a frame with headroom absorbs load growth without another swap. The costs sit nearby: a larger coil pulls more inrush from the control transformer, the housing takes rail space, and the short-circuit coordination row changes with the frame.

Can I keep the C09 and accept a shorter contact life?

No. A motor whose nameplate full-load current exceeds 9A on AC-3 duty is out of spec on that frame, which is a rating question, not a life question. Verify the nameplate current against the 9A rating, and upsize when it does not fit.

Do the C09 accessories fit the C16 frame?

No. Adder blocks and suppressors are frame-specific parts, so spares bought for the C09 stay with the C09. Order the accessories listed for the C16 frame in the datasheet, and fit them before the power wiring claims the space.